Hello & welcome,
You're so lucky to have found an atty that even knew about TOS, & he knew of a dr that was up on it too - now that is major lucky

most of us had to search for attys and Drs that even just have a clue about TOS or even chronic RSIs

hopefully your tests will be able to show exactly what the problem is- and then we can discuss options and pros and cons of surgery.

The Mri & Xrays should clearly show if the extra rib is there or not and how big they are. some are a full set and some are small or partially formed.

Posture, ergonomics, body use and awareness are all things you can learn about and use while you are waiting for the tests & results.

useful sticky & Drs & pT sticky
http://neurotalk.psychcentral.com/thread84.html
http://neurotalk.psychcentral.com/thread135.html

I wouldn't rush into any surgery without getting second opinions and researching the surgeon and his experience level with this surgery.

About the redness- is it when you raise and lower your hands?
or does the redness happen for no explainable reason?