I think he should definately see a Doctor about this. Also if he keeps a food diary it might help him to pinpoint what seems to trigger these attacks off. Obviously I can't say for sure it's not a stomach bug but he has no fever, nausea or vomiting. He may well have an intestinal bug though. My aunt had this and she had D* on and off for a few weeks before she saw a Dr. Never once felt sick or got sick though. Has he been stressed? Could be IBS?
Anyway it could be anything so definately go see an expert so he can get something to at least relieve the symptoms and try not to worry too much.
xxxxxxx
Be courageous, believe in yourself, and be the best woman you can be. I'm with you all the way.