Aqua therapy likely won't do any good. I did it after my fusion surgery. It is meant for those not ready to handle standard therapy. Me and one other girl with severe scoliosis were the only ones there under 60. I think most therapy pools max out a 4.5' deep (and I always fought over the deepest point).

While I still have some issues (not directly TOS related), I can swim with no problems post rib resection recovery (which included PT). It is one of my only true pain free activities.