Seek out Vascular surgeon specialists, especially if they are very experienced with TOS. Second opinions or more & probably more testing like a Doppler perhaps.

Many have had the surgery and vascular TOS cases usually has positive outcomes. ( With an expert surgeon )

There are some recent threads posted that have had good results.
the main TOS threads list-
http://neurotalk.psychcentral.com/forum24.html

TOS testing info-
http://neurotalk.psychcentral.com/post580952-11.html

our useful sticky thread full of information-
http://neurotalk.psychcentral.com/thread84-3.html