Irritable Bowel Syndrome you say? Hmmm... IBS is sometimes linked to SIBO (small intestine bacterial overgrowth) and the overgrowth of bacteria is often the cause of odor. Hmmm... maybe I'm just jumping the gun too quick. You said your doctor diagnosed you with IBS 11 years ago huh? Did you notice any changes in your odor or anything else during that time? What type of symptoms did you have for IBS?(ex. diarrhea, cramping, constipation).Also do you still have IBS? Have you ever thought about trying a FODMAP or SIBO diet, it's intended to help people with IBS. Sorry for so many q's, but I just have two more questions. What do you personally feel is wrong with you and did you start getting these symptoms during your teen years?(more like during puberty)