Thanks for writing in.
I am a qualified and certified cardiologist. I read your mail with diligence.
If you are taking Xanax
under supervision. Your doctor must examined you and would have excluded possibility of hyperactive thyroid
and other diseases. There is no harm in taking it for a brief period (as prescribed) and after that report back to the doctor for follow up. Hear rate in a person with anxiety
can be a bit on higher side and that should not make you worried. Hard heart beat is a perception and when you do not have heart disease
you should not worry about this either. Good Luck.
With Best Wishes
Dr Anil Grover