Only PT a few times a month?? Are you working still along with that?

I hope you are having TOS expert PT and not the standard plan of stretch & strengthening while you are in pain..

Usually my PT sessions started at 2 times a week til improvement was shown then reduced to 1 a week, and I wasn't in super high pain only about 6 at worst times.

I did have the best results with a really good multi talented chiropractor.. mine was chronic RSI work injuries, postures related..

Yikes that's a lot of meds and if they aren't working for you....

Is the dxing and rxing dr a TOS specialist?
No cervical spine issues? no extra cervie rib?
Do you know how you acquired TOS - work, injury sports etc?