Here are some things that could possibly be the problem. I am a 20 year old nursing student who has experienced the same problem, rectal discharge it was brought to my attention that it couldve been brought on by irratable bowel syndrome which theres no test to diagnosed you with it. The doctor has to do a process of illimination. It also could be celiac disease so look these two up and see if there similar to what could be wrong with you I hope this information can help.