Thanks for posting your query.
With the available described symptoms, possibility of heart disease
appears to be low.
Recurrent attacks with improvement after a time rules out chances of heart disease; heart disease needs specific treatment and without this, condition won't improve.
Although there may be possibility of arrhythmias.
You should consult with internal medicine specialist and should go for thorough check up.
You should go for chest x ray
(ECG) on preliminary basis.
You should also go for holter monitoring to rule put any arrhythmias.
There may also be possibility of panic attacks if above mentioned investigations are found to be normal.
Then you should consult with psychiatrist
for better treatment.
Dr. Mayank Bhargava