Endometrial hyperplasia is the overgrowth of the endometrial tissues, as a result of too much estrogen binded to the uterine smoother muscle receptors, or too many estrogen receptors developed in the uterine smooth muscle binding too much estrogen, or high blood levels of estrogen stimulating uterine hyperplasia.
This problem is very similar to the prostate enlargement.
At the same time, the estrogen receptors spread or take over the testosterone receptors in the uterine smooth muscle. With testosterone deficiency in this uterine contractile muscle, the muscle loses its elasticity and contratibility, sexual orgasm (the powerful uterine contraction) will cause a lot of pains and cramps which can spread from the low abdomen to the anal/tailbone muscle. Men with a low testrosterone level in the prostate muscle have experienced the same problem too.
My suggested solutions for you are;
1. Balance your testsoterone and estrogen level in the the uterine contractile muscle.
2. Use plant hormones/plant estrogen (about 1/1000 strenghten of your estrogen) to take over your uterine hormone receptors. This mechanism is the same as that of shrinking the prostate back, where plant hormones/plant estrogen take over the hormones recepors and disbind excess hormones out of the receptors sites.
3. Feed your uterine muscle more free testosterone to increase the flexibility and contractibility of your uterus upon sexual encounter.
ViaGrowth-IV/FibraTea(item 1-005) contains all essential ingredients to help you out.

http://action.love/mail/herbform.htm
By the way, you should eat a lot of seeds, nuts, soy products, fresh vegeatbles and fruits, and avoid red meat and dairy products that contain too much artifical animal growth hormones.