Hello, I came across your post and I haven't read your entire feed, but here is the little bit if information that I know about breath that smells like poo. When I was at my natural doctor a few months back, out of the blue, for no reason she says to me, "Do you know that when your breath smell like poo its because the Ileocecal Valve is open. This valve is located between the ileum (last portion of your small intestine) and the cecum (first portion of your large intestine). Its function is to allow digested food materials to pass from the small intestine into your large intestine. The ileocecal valve also blocks these waste materials from backing back up into your small intestine. It is intended to be a one-way valve, only opening up to allow processed foods to pass through. However, when open, can cause horrendous bad breath.
I just thought I would pass this on as information. Hope it brings some sort of resolve to you.