Hi, thank you for posting. I have gone through your query and I understand your concerns. In the most common cases Irritable Bowel Syndrome is treated with Lactifiber, and you can use it because it is a safe medicine. But you should also take Eucarbon to eliminate gas problems and bloating(indigestion). Foul smelling stool is caused by Giardiasis. To confirm the diagnosis microscopical examination of is recommended. Contact your gastroeneterologist and your infectologist. I hope this information is helpful. All the best. Dr. Behar.