I'm finding many similarities in your symptoms and diagnoses to mine.
I also started with arm and hand problems, numbness and shooting pain - very carpal tunnel like. They told me I didn't have that. This was back in 1990. Then the pain progressed more into neck, shoulder, and upper back - constant spasms in all those muscles, along with the arm and hand aches continuing. I was also diagnosed with TOS, but then told that maybe I don't have that either.
MRI's also show slightly herniated discs at C4-5, 5-6 and about 10 doctors all concur that it is not the cause of the pain? How can it be that so many of us have these symptoms and herniated discs, and it is not the cause?