Hello I had gone through your question and I can understand your concern Looking at your history this could be due to any of the following IBS (irritable bowel syndrome) Inflammatory bowel disease like crohns or ulcerative colitis indigestion of particular food I would suggest you following guidelines avoid excessive stress and anxiety have plenty of dietary fibers and fluids 3 to 4 liters a day Do not consume liquor or smoking If it persists please consult a gastroenterologist do colonoscopy and further course of action hope you will.find my response informative and helpful feel free to ask for further assistance wishing you good health