She gave me a prescription 800 mg ibuprofen (4x what you get from drugstore-shelf Advil, etc.) and recommended that I stop playing the piano for a while. She also referred me to the Kaiser physical therapy department and gave me a brochure with exercises. As it turns out, they are very similar to the exercises I learn from my dance teachers. In fact, I probably should have been more suspicious early on that doing some of those exercises was painful.
Anyway, the ibuprofen seems to be working for now. I'm in much less pain. I can do several of the exercises with little or no pain. I was having some trouble shifting over the weekend (I drive a manual transmission), but I think I will be able to shift much better today (except perhaps to reverse). After practicing left hand only piano all weekend, I resumed two hands this morning. I was able to do most of what I usually do, although I had to take frequent breaks and play slower than I usually do. I'm going to my piano lesson in a couple of hours, and will ease off if my shoulder starts to bother me. However, I probably won't try dancing until next week.