Hi there
That sounds like a nasty concussion, and I'm sorry you've had such a weird and horrible reaction to it. I'd never have thought a concussion would lead to problems in your abdomen, but then CRPS is such a strange and random beast...
I'm sorry I can't help in any way, but please don't give up hope. Is there any chance you can find a doctor who does understand CRPS? With this new development, if you write to a few (even ones far away) they might be interested enough to have a look at your case and maybe suggest something. It does no harm to ask, they can always say no.
Ty to relax whenever you can (easier said than done, I know, sorry), as relaxing some of the sheer stress of being in pain will help your poor body cope a little better. Try meditation with some nice relaxing sounds and smells. Sometimes the simple little things can help a lot
Hang in there. I'll be thinking of you.
Bram