I want to Welcome you to our forum.. You will find so many caring and informative people here that suffer from many of the same problems that you do.. It's so unfortunate that it can takes years and multiple Dr's to figure out what is acually causing our problems.. It sounds as though you are finally on the right road by going to see a Thoracic cardiovascular Dr. There is a list of recommended Dr's that deal with TOS that you can refer to on the forum http://neurotalk.psychcentral.com/showthread.php?t=135
Hang in there Martha you came to the right place. There is alot of support here and knowledge.
I wish you the best luck at your appointment next week.. Keep us posted..
((Many Hugs))
Dawn