I had this too...I went to a physio and it needed to realign my pelvis. The pain was alleviated within 2 sessions...
He did give me some exercises that helped...but I wonder if they only helped after my pelvis was realigned. Basically, I had to lie on my back, put a pillow between my knees and push hard against the pillow...and then have DH put his hand on the outside of my knee and then I had to push hard against that...
I hope you can get some relief soon...it's horrible, hey?
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