For the armpit pain, it could be lymph system clogged up.
Some simple lymph drainaige massage might be helpful. There are videos on youtube showing how it is done, or seek out a masasge therapist for it.

Some gentle heat might help too.

Did it seemed like the PTs you went to were skilled & knowledgeable?
What kinds of things did they do for you?

weights, stretchy bands?? not good for most w/tos

Did they do much "hands on" therapy work and/or posture work?

For the hand atrophy -- it might be a specific area that needs to be released, so I hope they aren't suggesting rib resection surgery just as a shot in the dark..
I don't know enough about it.