Maybe it would be a good thing to be anxious at your appt. You'd be with the best person to deal with it. He/She could point out that everything you're feeling is not harmful to your body.
I get nervous before therapy appts. I haven't gone in years because the last one said there wasn't anything else he could do for me. I knew the techniques. I've read the books. I've taken the classes. But sometimes it would be nice to have someone to talk to about anything.
Anyway, this is not about me. You will do well. Stay in the moment and remember only positive self talk! Don't allow any negativity to enter your head. Good luck today!