2 of the PTs I saw - did the pulse/position testing shown on this site {near middle of page}- actually a few more arm positions to pin down exact pulse stopping angles
my chiro did many of them too
http://www.nismat.org/ptcor/thoracic_outlet/

did your Dr check both arms - like in the photos?

Fibro info-
a fibro pain & symptoms chart / graph -
http://www2.rpa.net/~lrandall/fmslog.html

our stickys have some fibro sites listed in post #1
http://neurotalk.psychcentral.com/thread84.html