I have been suffering from this for almost 4 years. I noticed it before but it wasn't an everyday thing like it is now. I am not completely sure about my food allergies but I seem to be lactose intolerant. I have found that by staying away from lactose and also for the most part food containing gluten products (this includes beer etc.) then the odor is barely noticeable if at all. I have been eating a lot of fruit and veggies to provide more fiber.
Trust me, I've tried everything else. Enemas, cleansing drinks, colon cleansers, charcoal, the mushroom stuff, you name it, I've tried it. The only thing that seems to work is changing my diet. I feel that a long term diet change would eliminate the odor all together but that is a serious challenge itself. Good luck. You are not alone, my doctor thought I was imagining it too.