A good PT may be able to help you sort it out. When my shoulder was frozen and I was having awful pain running from my upper arm down into my wrist, a sort of sharp achey pain when I was stretching it, she said definitely nerve pain. Of course you have no continuous muscle running from upper arm to wrist. It was an a-ha moment! At the time I would have sworn muscle pain, but it made sense.

Honestly, a good PT is worth their weight in gold. And, I never would have said this a year ago, a chiropractor. I found one who is super knowledgeable, gentle, knows what my limitations are--basically, NOT a twister or jerker. Weekly, I get an upper body massage for an hour and then she does a spinal adjustment. I really have felt better overall since starting this.