I know on the old forum there were quite a few that had TOS with fibro or CMP {chronic myofasial pain} dx'd also.
Of course they could have been a true/correct dx or a dual dx or a mis-dx, due to the overlapping sx of all of them.
There are ways to sort most of it out - TOS vs fibro vs CMP - there are some links about it in our useful stickys {1st post}.