Cler

Hi,
Glad you’ve decided to see a therapist. I just happened to read your post, and from what I understood you may have hamstring tendinitis. The injury could have happened at some point due to stretcing the muscle beyond its physiological capability at the time and/or as a compensatory mechanism to your psoas (psoas being hip flexors vs. hamstring being extensors). In any event, the inflammation in that area needs to come down. ONe of the most effective PT modalities would be ultrasound which would help with breaking down the scar tissue and also reducing the inflammation.
Also have them check your functional leg lengths. If you have any leg length discrepency, you would put more strain on one side than the other.
Hope you get the help you need and can get back to your practice quickly and pain free.
Best wishes,
Cler