30min-hours after eating, i sometimes become ill. an uncomfortable visit to the toilet usually helps. can't see a pattern for possible allergy. cause?

Food intolerance: Your symptoms are consistent with food intolerance, of which lactose intolerance is the most common form. If your diet contains dairy product, try to avoid it for a week. Symptoms should improve right away. Food allergy does not cause temporary stomach cramp that relieves with a bowel movement. Discuss with your local physician if your symptoms persist.