It sounds as though your biggest problem is anxiety and/or panic over your symptoms. You have been given
Xanax, but
Xanax is not a great solution for long-term problems like this. Quite often, a different, longer-term medication is better, along with some talk therapy.
Do you have health insurance? If you do, I strongly suggest that you ask for a referral to a specialist who deals with your major problem, which is--understandably--fear.