Thank you very much for your replies.
My PT and ortho doc (both highly rated) are very surprised I have shown no improvement yet. This leads me to think I have a particularly recalcitrant brand of this since they have treated many other cases.
I was given heat treatments at the PT facility but haven't used them at home. I haven't used ice only because I've read that heat can help draw blood to the site and enhance healing. I do wear the elbow band during necessary tasks and it seems to help (at least for the time being while I wear it).
I will stop doing the stretches that hurt the elbow and shoulder. However, there are others I do that are very gentle and are intended to improve scapular function and don't hurt while I am doing them.
I have read about so many different things on-line that helped other people and I have tried them all: flex/extend the wrist, stretch a rubber band wrapped around the fingers, and also the Theraband Flexbar.
I will give your suggestions a try and see if they work for me. I'm wondering how long I should wait to see if I feel relief -- 2 months, 4, 6 ??? -- before I consider surgery. If I do end up choosing surgery, then I want to be sure it is the only remaining option for me and not go into that unnecessarily.