random episodes of extreme stomach pain?

Full disclosure, this isn't about me. It's about my boyfriend. I had to clear that up since I didn't want anyone thinking it could be PERIOD pain. Occasionally my boyfriend gets episodes of EXTRMEME stomach pain. The first five minutes are the most intense. He can't talk and usually just sits there breathing heavily. He feels a combination of nausea and diarrhea. When it starts, there is actual stabbing pain. As it progresses, it gets better and better. It happens once a month or so with no patterns. He keeps an eating journal and food also doesn't seem to play a role. (No patterns). Please help. This is the only site I can post on since I have no yahoo account.