Many with TOS got worse with cookie cutter PT, the stretchy bands , building the wrong muscles.. Stopping repetitive /straining activities may benefit more and adding flexible movements , gentle stretching.
If all your right side is affected.. check your shoulders, hips, knees do they look level with the other side?
If uneven, you might look into nucca /upper C spine adjusting..
Some info - Up C Spine

Some with internal scarring post op tried many things for pain with little results..