Hi. Thanks for your query. Noted the history of being under treatment for IBS but recently have noticed yellow discharge from anus after passing motion, also have got more gases, blood work has come normal... When there is a known case of IBS means that I hope all the relevant tests are normal. Please get the following tests done if not yet done: Stool tests for three days, Colonoscopy And CT scan of the abdomen as this will clear whether there is any colon or rectum cancer. This is very important as the yellow discharge can cone due to cancer also. If the reports are okay, go for a course of an antibiotic and metronidazole. Long term Probiotics, proper dosages of multivitamins do help in recovery. Get a proper clinical evaluation, Expert s advise and get well soon. Control of stress and/or anxiety are very important.