Hi. Thanks for your query and an elucidate history. The intermittent stomach aching in spite normal bowel movements and without vomiting can be due to the following reasons: subacute intestinal obstruction, allergy to a particular food-stuff or a beverage, I would advise you the following: Standing X-ray abdomen examination of the stool. observe which food or beverage is causing such a problem and stop it altogether for lifetime. Ultrasonography. I hope this will get cleared soon if you take a probiotic, activated charcoal tablets.