Hi! Good evening. I am Dr Shareef answering your query. One could label it as IBS only after excluding other organic causes for your other symptoms like low weight and much cramps along with a partial villous atrophy, which could occur in celiac disease. You might have to undergo some biochemical investigations, some endoscopic biopsy of the intestinal mucosa, and a hit and trial way of excluding all food items containing gluten as their constituents with the consultation of a gastro-enterologist and a dietician in your area. Till then, I would advise you to go for a high roughage diet, and enough liquids, with avoidance of food from outside specially the fast food, and complete NO to consumption of alcohol if you do. I would also advise you for an anti spasmodic along with a proton pump inhibitor drug for a symptomatic relief of the cramps. I hope this information would help you in discussing with your family physician/treating doctor in further management of your problem. Please do not hesitate to ask in case of any further doubts. Thanks for choosing health care magic to clear doubts on your health problems. I wish you an early recovery. Dr Shareef.