Thanks all. Mine is the Neopolitan style of TOS--neuro, vascular, & lymph--but primarily neuro. So I wasn't sure what the swelling was due to. And I didn't know if the swelling is simply annoying or dangerous. So for now I will go back to short walks outside w. my arms supported by the fanny pack and pool walking. this is so frustrating...I want to feel like I can be outside enjoying the beauty of the world vs. having my arms hang over a treadmill bar or on the surface of the pool. Silly that I thought I could "train" my arms to use the fanny pack less. My arm, bp, & neck are more flared than usual 3 days later so I will make an appt to go see a new doctor. So far I have found only a surgeon that treats TOS. He does some special ultrasound. I can't imagine having yet another test ... has anyone found an ultrasound valuable?