Every now and then it does feel like the TOS pain and, like you, it concerns me. Today my last 2 fingers and the inside of my arm "fell asleep" while I was throwing a baseball. Today was the first time that I threw from a farther distance (I was told I could by my PT) and it was going well until the numbness set in. I stopped throwing immediately and after about 10 minutes I had full feeling again. I am already sore but I am glad the numbness went away. Like Romans8 said, finding the right balance in activities is key because when you feel good you want to do more and that's not always good. Lifting heavy things is still a challenge because it tends to make my nerves flare up. Anyways, this is just a process to getting better and re-learning a part of your body that is trying to function normal again.