My dx's were of various RSI and shoulder/neck strains for a few yrs before it all joined up to become TOS in 03.
I am one that does pretty well with good PT, regular chiro and self care but it will be a lifetime thing.
I had about 2.5 yrs that were pretty restrictive due to sx & pain- part of it was due to not knowing anything about TOS, but once I learned about it and triggerpoints, spasms, posture awareness and all that kind of stuff I took my healing into my own hands after wc denied and we were appealing.
I felt my treating dr at the time was not being assertive about searching for real help either. I'd get well with PT but as soon as I used arms much pain would reappear.
So I began to look for DC/PT on my own - since claim was denied anyway- but had to pay cash to not confuse things ins wise & wc wise.

This is getting long LOL
It might take a couple of years of consistent focus on health, healing, postures & self care. So don't be discouraged if it takes time.