The thing to remember is that if you do have CRPS or similar post trauma nerve pain, the pain you have and that you will feel in your PT is 'useless'. It's not like 'useful' acute pain which is indicative of something being wrong and is a signal that you can cause yourself more damage if you keep going.

I'm not saying that its nice or enjoyable or anything like that! Don't get me wrong, its deeply horrible. However, one of the things that is important is not to fear the PT or the pain that you feel. The fear makes the pain directly worse and it also limits you. Try and be as relaxed as you can and remember that the process is one that ultimately is supposed to be about making things better.

I hope it goes well for you.