Hello,
So many things going on..
I suggest using our search tool and exploring the useful sticky threads in the upper section of each forum topic.

There are past posts on Ehlers Danlos Syndrome, POTS, hyper mobility on our Thoracic outlet syndrome forum.. TOS for short..
TOS can be related to arm & neck pain and more, blood flow or nerve impingement..can be work related , desk postures , computer etc... forward arm/head postures...

Might consider adding naturopathic or other alternative care with all that going on for you..