Wow, some of it sounds like it could be TOS related , but some of it could be due to scar tissue , or even RSD/CRPS...

Have you been evaluated for hypermobility? All the popping and such could be due to extreme mobility of the joints.. and any muscle spams can make it even more so..

Did your PT try any IF stim, low level laser, ultrasound for pain relief?
Any manual trigger point work? TrPs really need to be resolved before muscles/spasms can be successfully worked on..

Explore our SSDI forum for tips & help on that process..there's a sticky on tips for starting a claim..very helpful.
http://neurotalk.psychcentral.com/forum28.html

From what I understand, it isn't necessarily the dx's themselves that help with SSDI , it is that you can not do any gainful work.