Have you seen any information about thoracic outlet syndrome? {also called TOS for short}

Basically the trouble originates with the neck muscles , collarbone or pec minor, entrapping the nerves and or blood flow to the hands /arms.
repetitive & overhead work can cause it.

Are you going to your own dr or a MCO/or company supplied dr?

for the work comp part you need to have the treating dr add your hands & arms - also your new pains too- the neck and such.
be sure these are added or it will get pooh poohed and shoved aside.

We have a work comp forum as well as a TOS forum.
here's the useful sticky thread for TOS info- post # 1 is a crash course to get you started to see if it sounds like a candidate for your symptoms.
http://neurotalk.psychcentral.com/thread84.html

work comp-
http://neurotalk.psychcentral.com/forum30.html

I'm surprised you get to choose the IME.. usually the wc carrier chooses the IME dr and it is a dr that tends to lean favorably in the wc direction and not favorable to the worker.