Hi, I am a 43 year old female that smokes!!! I have been having a few health problems in the last 2 years. It all started 2 years ago when I got bloodwork done and my Doctor told me my blood sodium level was a point below normal, she told me to drink gatorade to restore my level. Eventually the symptoms associated with low sodium levels went away. Then last year I went to her with similar symptoms and more bloodwork was done, the results were that I had Hypothyroidism and a B12 deficiency, she put me on synthyroid 100mcg and 1000 mcg of vitamin B12 pills. I made her do more bloodwork 3 months later and things were looking up. In May of last year I was feeling lousy and went to the emergency room because I was having palpations and they found my synthroid dose was too high and lowered it to 88mcg, after a while I started feeling better. I told the emergency room doctor about heart problems running in my family so they ordered a stress test which came back good, they told me I wouldn't have a heart attack from blocked arteries. When I told my family doctor (years ago) about the heart problems in my family she told me " you don't need to worry about that because it doesn't affect women until menopause" and wouldn't send me for any tests!!!!!! In December 2013 I began having palpations, so I asked the doctor for more bloodwork and everything came back within normal levels, at that time I showed her that I was having edema in my ankles, she checked my blood pressure which was 117/74, my heart rate was 88, so she sent me for an E.C.G. It supposedly showed that everything was normal except my resting heart rate at that time was 92 b.p.m, so my doctor put me on 150mg of Rythmol 2 x a day. On the 25th of January I called 811 (nurses hotline for health inquiries), they patched me through to 911 who immediately dispatched an ambulance because my symptoms sounded like a heart attack!!! When the paramedics did an E.C.G on me it showed I was in sinus tachycardia and left atrial enlargement, the E.R doctors put in a request for a holter monitor and an echocardiogram. I saw my doctor on the following Monday and she said she "doesn't believe it's my heart" and gave me anti-anxiety meds. With all the things I have just told you what else could it be? Even with the Rythmol I am still having light-headedness, edema, breathlessness, occasional chest pains and fast heart rate; this morning it was 110b.p.m, now though my blood pressure is dropping yesterday it was 107/68. It normally has been pretty close to 120/80. What do you suggest?