I Have the same problem. But i must say much worst than you experiencing right now. Have this bad breath for almost 6 years now. At first i thought its because of my teeth. I went to my dentist and tell this problem. Nothing is wrong with my dental hygiene. After that i went to my pulmonologist. I have a scar in my lungs, again it is not my lungs. After that i decided to go to an ENT specialist. He didnt saw any tonsil stones or mucus that causing my BB. Last doctor, A Gastro specialist. He prescribe me a proton pump inhibitor. I took that for two weeks,but nothings change. While making this reply,a fee minutes ago my mom told me, "did the cat poo? It smells like poo".it was my nose.everytime i exhale,my nose smell also worst.my gastro doctor wanted me to have a endoscopy. Which is a bit expensive. Im saving money for thw endoscopy but im reading first stories same like mine. And wanted to know if its really my digestive problem. Wanted to gather more stories and simple and cheap remedies. Everyday im daydreaming of talking to people wihout covering their nose.its so deppressing that you need to avoid talking personally to your friends because you afraid they will tell it to others and youll be the center of jokes.