I have suffered with this exact same pain since I've been 16 years old. Birth control stopped it in it's tracks. It was always assumed to be gynelogical pain. Only happens to me once, twice, sometimes three times per year for about
one to three days. Unbearable pain, sometimes vomiting, feels like I'm being stabbed over and over in the lower right. Fast forward to about
age 40, and my gyno finally took me off birth control (due to my age) and removed my ovary and my appendix (due to pain). No pain for about
a full year. Thought it was over, then the pain again. He said to me GEE maybe it's Crohn's. Go get a colonoscopy. In 25 years of pain and even some ER trips for pain, NOT ONE DOCTOR ever suggested anything like this to me. I couldn't believe it when he said that! I have googled and googled for years to figure out what this pain is and have come up with nothing over and over. Now, I still haven't gotten around to getting a colonoscopy, but my 9 yr old girl was just diagnosed with it!) Funny thing is, I have no other symptoms. I'm not pale, not skinny, not fatigued (except when pain strikes), not malnourished, not anemic, not feverish, no body aches, no stomach pain, no diarrhea, etc etc. So...I'm still guessing.