Hey, Im going through this as well. The hardest part is convincing a doctor you have it, cause first things first you have to get diagnosed it will help you ( im still trying to be diagnosed and its been a year now). I take vitamins, probiotics, anti-depressants. Try something called movicol you mix it with water and drink it, it draws water to the bowels through osmosis so if there's any fecal matter stuck to lining it will soften it. that could be the source of the smell, so i suggest getting a colonic irrigation im getting one soon so ill let you know how it goes .