Hi snookies61,
I'll post our useful sticky thread for you , in case you haven't seen it yet- tons of info links, articles , anatomy pictures, therapy & treatment info, videos of triggerpoint , posture, massage.
post # 1 is the crash course of TOS links
http://neurotalk.psychcentral.com/thread84.html

I did find a very good chiropractor that uses a variety of therapies for my treatment - Nimmo/triggerpoint /myofasial release, Ultrasound, low level laser/cold laser, infra red light, Interferential stim & adjustments .

These all help to reduce the pain and muscle spasms for me, and for at home I have a far infra red heating pad and a EMS {muscle stim} and my foam roll and inflatable exercise ball for stretching and posture work.....

Do you have any swelling or muscle wasting of your hand/arm?

You do really need to find a very qualified dr and not one that just says the know about TOS- and only go to very expert and knowledgeable PT persons .
Unless something acute brought on the pain and sx and it possibly can be treated with expert therapy & posture/bodywork - surgical removal of the extra rib is needed.
But you really need to get to an expert - one that will do the in depth evaluation appt and order the proper tests.
It takes a lot of calling and double checking to find a good dr - unless our Drs & PT list has some near your area.
here-
http://neurotalk.psychcentral.com/thread135.html