I'm not nervous about taking steroids, because my father HAD to take them every day of his life to combat his Addison's disease. Which is good because, with the few flares I've had, my neuro always suggested oral steroids, and they worked. So I'm not surprised that injections into your shoulder are helping.

Not Botox but hydrocortisone (steroid) injections in shoulder for pain. It works great.

I have read about them, but I have never explored into it. However, the things that I have read, from published materials, seem to laud it.