I can relate to feeling scared. I really feel for you because of the rsd in the mouth. I know when I have an apt with my rsd areas it scares me cause I can't handle any touch. I try to self talk and I always speak up for myself now to do doctors and am not pushed into anything.
I agree with the others about trying xanax before. Think of us your neurotalk family during your apt. We are thinking of you and you will get through this. Deep breaths,positive thinking,calming thoughts,and a little xanax.
Sending warm thoughts