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Detailed Answer:
I read your question carefully as well as some of your exchanges with my colleagues.

The symptoms you describe are not that specific, meaning that they could be in the setting of many different issues. However you seem to have excluded many of these possibilities having done MRI, EEG, 24 Holter EKG and some blood tests you have excluded nervous system conditions, heart arrhythmia, infections etc. You have a tendency for iron deficiency, that in turn can lead to anemia which causes those symptoms, however that is when there is a significant drop in RBC and hemoglobin levels, with those RBC levels I do not think that is the cause.

So among the few possibilities which are left I would put an inner ear related issue like BPPV which I believe was already mentioned by my colleagues. There is no imaging or blood tests for that, the diagnosis is from the symptoms and by some special maneuvers performed by an ENT specialist, like the Dix Hallpike maneuver. Its symptoms are alleviated usually through medication like meclizine.

Orthostatic hypotension is also a possible cause, meaning an excessive drop in blood pressure when changing position from supine to standing. To diagnose it repeat blood pressure measurements lying down and then standing are the first step. However at your age if you do not suffer any other conditions it wouldn't be that likely, it usually is in the setting of other conditions.

Last but not least is anxiety. Frustrating as it may seem anxiety can mimic any symptom, whether neurological or of another kind, and it should be considered in the setting of unexplained symptoms with normal physical exam and diagnostic tests.

I remain at your disposal for other questions.

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Brief Answer:
Already seen those results.

Detailed Answer:
Thank you for that info, but if your read my answer carefully I already stated that I knew about the normal MRI, EEG etc, from going through your past questions with my other colleagues on this site. I had seen all those results and as I said they do not explain your symptoms.
So my opinion and the possibilities I listed remain the same as before.

Let me know if I can further assist you.

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Detailed Answer:
I am sorry that you feel so frustrated. I invite you to see the glass half full though, personally I would prefer not finding any condition, frustrating as that may be, rather than the tests finding something serious like a brain tumor, epilepsy, heart arrhythmia etc. So you should take all these negative tests results as good news.

I do not know your doctor, but judging from the tests you mention I do not think he has been lazy or underestimating your symptoms, you seem to have done many extensive tests in order to find a cause. Remember that us doctors do not have the answers to everything, at times there are issues which we are unable to explain, our priority is to detect serious issues which require urgent treatment and judging from the tests you mention your doctor has tried to do that and some more.

The heart beat over 140 episode in itself doesn't mean much, happens in most of us depending on physical activity or stress, the important thing is the regularity of the heart rhythm, not simply the rate. I am assuming it was regular since you weren't told anything else.

Unfortunately for some issues there are no diagnostic tests, and there are phenomena which we are unable to explain and coin them as being due to anxiety. That doesn't mean (to quote you) that you are crazy though, anxiety is a very common issue, affecting about 25-30% of the population in XXXXXXX So it is a valid hypothesis in cases where no other cause is found and where the symptoms do not fit with an anatomical area, with a specific nervous, cardiovascular or other system dysfunction (I am saying that not only based on this query but from reading other queries of yours in the past as well).

I hope you'll feel better soon.

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Detailed Answer:
Sorry for answering a little late but your follow-up came after I went to sleep and afterwards at work.

The diagnostic possibilities after reviewing your last post remain more or less the same. The symptoms do not correspond fully to any neurological lesion and the normal MRI and EEG support that. As I said possibility of orthostatic hypotension should be considered but to be honest I do not think that very likely as you describe symptoms even when simply lying down. So the possibilities left would be still BPPV and anxiety.
Honestly because of the variety of the symptoms which as I said are not tied by damage to one system I would still put anxiety in first place.

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Detailed Answer:
The most common mechanism for anxiety disorders is an imbalance of the neurotransmitter levels in the nervous system, mainly in what is called the limbic system. It is thought to be related mainly to low levels of the GABA neurotransmitter, although since it is at a inter-cellular microscopical level there are no imaging or blood tests to confirm that it is mainly a matter of hypotheses. It happens in genetically predisposed people often combined with external stress factors. The symptoms can be many such as dizziness, difficulty concentrating, breathing difficulty, fast heart beats, restlessness, difficulty sleeping, numbness in the extremities etc etc. None of the symptoms are specific (meaning can be found related to other conditions) and not all do necessarily manifest in all people. So anxiety is suspected only when tests exclude other causing factors and distribution of symptoms and physical exam doesn't indicate any other disorder.
As for the conditions you mention I do not see any indication from your symptoms of any of them. Certainly not meningitis which is a life threatening condition. Lupus is a condition which can affect any system in the body, so it is suspected when there is evidence of involvement of many systems with symptoms involving the skin, joints, heart, kidneys etc. The brain can be affected as well but not alone there are other organs involved.
As for MS it also as the word multiple suggest involves different parts of the nervous system with other neurological signs like motor weakness or numbness of the limbs, double vision, visual loss, balance and coordination issues etc. Anyway lesions would be detected on MRI in over 90% of cases, so normal MRI combined with no other signs excludes that.

I hope to have been of help.

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The first step is preferably without using medication. It involves exercising, activities like yoga, avoiding stimulants like coffee and energy drinks. When not enough psychotherapy is the next step, it can teach how to identify anxiety provoking thought patterns and also relaxation techniques to cope with the symptoms.

If all these methods do not work and symptoms really affthen medication may be considered, hopefully won't be needed. For long term anxiety treatment usually antidepressants are the preferred class, like amitriptyline or citalopram. Their action may need some weeks to come into effect. Benzodiazepines are also effective and their effect is felt right away, however they are used only if for short periods because of the potential for abuse.

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Brief Answer:
Unlikely.

Detailed Answer:
Vitamin B12 deficiency can cause neurological damage. Usually happens in vegetarians or people who suffer from a condition called pernicious anemia.

The symptoms it manifests with are multiple, yours wouldn't be a typical presentation though. Most common symptoms are tingling and numbness, painful sensations in the extremities, later on accompanied by weakness. Balance issues may be a part of it but doesn't explain those wave and heartbeat sensations you describe.
Your blood count is against that as well, as when there is anemia related to vitamin B12 deficiency the blood cells have the distinguishing feature of being of a greater volume than usual, in the blood test results you have provided the mean volume is normal (at 82, with the norm being usually 80-100, so far from the upper limit).

So I do not think it likely at all. I still usually prescribe it as part of the routine blood tests I ask from my patients as it is a cheap test, so no harm in testing vitamin B12 levels, but I do not think it is a likely cause.

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Detailed Answer:
Neurotransmitters are the substance through which nerve cells convey signals to each other. There are many of them, produced in different brain areas and stimulating other areas by stimulating or inhibiting them. Their effect depends also on the receptors in the available cells, they may have a stimulating effect on some receptors or an inhibiting in others. So it is a very intricate network about which science has still a lot to learn. The same way there are neurotransmitters for movement and sensations, there are neurotransmitters involved in the way we feel. There are difference in their levels between different people which make for differences in our character, the way we respond to life stressors etc. People with anxiety are thought to have such neurotransmitter levels as to predispose them to anxiety. You say to have no stressors in your life, but health anxiety is one such factor and judging by the fact that you seem think about one disease after the other that that is your case.
These levels may be influenced by certain medications. However blood thinners are not such medication. They do not influence neurotransmitter levels when they are given and anyway since you do not take them anymore they do not have any effect of any kind now, so it's out of the discussion.

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