we have a TOS forum here - have you found it?

http://neurotalk.psychcentral.com/forumdisplay.php?f=24

as far as meds or herbs I don't know that any will help if you have a compression happening to a vein or artery.
Posture and bodywork may help if that is part of the cause - plus when in pain we tend to slouch and hunch and not breathe fully.