There is objective data that can confirm RSD.....the skin color changes, swelling, excessive sweating, etc. Those go with the subjective complaint of pain seemingly out of proportion to the original injury. RSD usually occurs in the extremeties....unless something like TOS sets it off in the trunk.

Although TOS is a diagnosis of exclusion in terms of diagnostic tests, there are groups of symptoms that unite us.......Pain between the neck and shoulderblade in back and under the clavical in front, numbness and tingling down the arm in an ulnar nerve distribution, etc

If your doctor is debating which one that you have.............I'd get another doctor. Aside from pain, the other symptoms are very different.....and they are not mutually exclusive, some of us have both