I have read your question,
Firstly I would say that , you need not worry a lot , half of the diseases can be cured by the help of positive thoughts and peaceful mind. Without knowing the actual reason there is no point in assuming that you will have an heart attack
Tickling sensation (=chest paresthesia
) as you said generally arises due to various reasons other than cardiac issues also. Chest paresthesia is nothing but an prickling sensation one feels below the skin in the chest cavity , it may arise due to irritated nerves,numbness
,infection,Gastrointestinal maladies etc. Certain cardiac or pulmonary infections affect the heart, the sack surrounding the heart or the chest wall , causing swelling and inflammation.
In this case i would suggest you to wait for the reports and be relaxed and don't get tensed , later consult a cardiologist
for futher medication.
Tension as i mentioned above could be the cause for headaches
and pressure in your head.
So i would suggest you to meditate and wander the tensions away .
Let me assure you that today medical science has advanced a lot and yes most of the issues are curable and so does you case.
Wishing you a good health,