Yes, I have mittelschmerz. It is caused by the ovum popping free from the ovary, aka ovulation. It only occurs once for me each cycle, though. If you are having it 4-5x for 5-7 days, it sounds like something more than mittelschmerz, so perhaps that is why none of the gynecologists diagnosed that. The symptoms do not match. My first guess would be an endometrial cyst on your ovary, which I have also had, and the pain was terrible. (After tolerating it a couple of years, my gyneocologist finally did surgery and ended up taking one of the ovaries out--it was a lost cause.) But you say you have no cysts now, so I don't know. I agree that stopping ovulation might help, with hormones. Perhaps there is a very low dose hormone you could take that would be enough to stop ovulation but not enough to increase the blood clot risk. For example, the "mini-pill" contains progesterone only and does not increase the risk of blood clots.