When I raised my arms up for most of the doorway stretches.. the blood drained out of them.. still does, but I can manage it if I need to hold things up for a short time without symptoms coming back.
But it is not the right thing for me..

Many PTs are programed to do the generic treatment plans..
TOS needs a more advanced & personal approach, communication & adjusting the plan for you and your symptoms.

I had the best help with a very good chiropractor & also PT professor that also had his own clinic.. Plus consistent home work.. and a big reduction of activities that increased symptoms..

Medical providers can only do so much unless surgical or RX'd meds are needed.. much is a lot of self work at home..