I had the best luck by finding a expert /advanced PT
{this guy taught PT to others, he also was involved with ergo/workplace evaluations} and having an evaluation by him - cost to myself was 100.00.

That guy did the best overall & complete assessment of my symptoms, injury history, posture and physical testing that any of the prior various MDs had ever done.
The second best help was another advanced PT that worked in a phys rehab with a physiatrist - the PT was more help than the dr. {the PT did the testing/eval for TOS - dr didn't do a thing}