Does anyone have gluteal tendinopathy? Any successful treatments?

I have gluteal tendinopathy and am getting to the point that I can hardly walk. I've been to 8 doctors and had injections of several kinds to no benefit. I've been to physical therapy at least 10 times with very little benefit (I must have done 10,000 "clam shells" and "bridges").
The only thing that helps some and gives me a few hours of reduced pain is hydrocodone. I don't know if there's any point in pursuing more treatment.