I am sorry, both that you were nervous about the situation and also that the Xanax fucked with your head. If you want to medicate, is it too 80's to suggest valium? It's more of a muscle relaxant, as I understand it, but a lot of people (as far as I can remember) used it to calm down.
Or go with something else to distract you from the stress. Some like to cook. I know that you like to work out. Maybe that would help?