How many or how long were you doing the cable rows??
with weights or tension too??
I didn't start doing that sort of stuff until my pain/sx were down to a 1-2 on the pain scale.. and the PTs started me slowly to see how I did with it.
I think after a while with TOS the fascia gets involved or maybe even before , but it all becomes an interweaved web, one thing affects the other and on and on...round and round...
You have a lot of extra things going on too, so I think taking it extra easy on your self is the key.
[that feeling that my muscles are "alive"
Is it like a buzzing/inner vibration?? I had that in my forearms for a long time early on...very weird sensation...