Frances, you brought up an important factor - WARM pool! Mindy - Your docs are wrong about
laps. Of course I don't mean competitive training-type laps! I mean very, very slow stretching laps, but real strokes on your belly or back. But just walking doesn't stretch the whole body. I think weights should be added only after weeks and weeks of gentle working without them, and never to a part of the body that is injured unless under direct guidance of a qualified physical therapist.
I swim in the warm pool (used for therapy) at the Y. It's a half-length pool. 1 length each: freestyle, backstroke, breaststroke, elementary back stroke. Get out after 15 minutes or less to start, even if you feel like doing more. for several sessions, especially if you are not doing it daily. No weekend warriors!
Frances' idea of not overdoing the PT is right for most therapy centers, especially if you have a new therapist fresh out of school or one who has worked with sports teams. I'm in PT again now and have an older therapist who keeps me working much less than another place I tried. Her stretching is less intense than one place I went where a younger sports therapist thought it was ok for it to hurt.
I don't take my morning meds until halfway through therapy, so I know what hurts. After meds kick in I can lift the diesel can up onto the tractor, which injures the shoulder tendon more. It's hard not to do too much if you don't feel the pain. Even with gentle therapy I need meds and ice on and off for the rest of the day.