After lots of thinking i think that mucus may be the problem(although I cant explain the feces breath-maybe stomach or throat mucus?).One droplet of mucus,maybe combined with a little sweat,is enough for a whole room to stink like a pile of shit.Especially when being in the same position for several hours(eg sitting on a desk),your stomach empties,you start getting constipated for some reason(anxiety,IBS,hormones...) and then some mucus gets out.