Without going back through all your posts (I'm a bit pressed for time right now), is it safe to assume you're taking decent amounts of methyl-B12 (not cyano-) 1000 - 5000 mcg/day on an empty stomach?

Confusion is understandable. Things like PN and DDD (degenerative disc disease) can be pretty nebulous with regard to symtoms and presentation. I have both, and they seem to be pretty well defined in my case, though there have been times when I've wondered about causation.

Both can involve a lot of detective/home work, particularly for triggers. My wife gets something similar to what you describe in your arm (but in her neck/shoulder) and for the longest time could not find/make any connections/predictions (when, severity, duration). It took my watching her closely for several weeks to point out stress triggers she was unaware of, because of a delay between the stress trigger and the pain. We're still working on it, but now when I see her doing what I know will aggravate it later, I can at least try to intervene...

If anyone recommends physical therapy, try it, but if it's not working, rather than give up, seek out another therapist. We've been down that road several times now, and therapists are not created equal; their training, knowledge, and experience can vary greatly, and where one does not succeed, another can work seeming wonders.

Gotta run for now...

Doc