Welcome to HCM.
Fast heart beats can occur from a number of cardiac diseases as well as due to anxiety.
Best would be to consult a cardiologist
and let him examine you thoroughly and if indicated do an echocardiography
to see if there is any problem with your heart.
If all the investigations indicate that you have no heart problem or other organic causes for your fast heart rate
, then you need to consult a psychiatrist
for evaluation and management.
Wish you all the best.