Ischial bursitis

Has anyone been diagnosed with this? I have terrible pain in area between buttocks and hamstrings. For 3-4 years. Siting for more than 10 minutes at a time is almost impossible.
I have been doing intense physical therapy on and off for 6 years since an automobile accident. I’m in pretty good shape, except for this pain.
Finally diagnosed with ischial bursitis and having an MRI in two days to see if there are any tears in the hamstrings.
Too much PT?
Too much trail walking?
If there are tears, how are they repaired?

I’m using diclofenac 1.3 patches cut in half to take the edge off.
I’ve tried most RX meds and over the counter things.

Any ideas?

Thanks!!!