Hi thanks for contacting HCM... Here according to history nothing seems serious .... Your Colonoscopy report also normal.... So it could be simple functional bowel disease ... You need dietary and life style modification .. Eat more fruits routinely .... Drink more water. . Avoid non veg foods like meat .... Avoid smoking. ... Avoid excess tea, coffe .... Stress should not be taken as it can aggravate GI condition .... Regular exercise done. .. Take probiotic tablet supplement .. Fiber food included in diet like wheat bran , whole grain etc ... Consult gastroenterologist if not improving .... Take care ...