I double/triple-checked OP's post to make sure I hadn't posted it myself and forgotten about it. The OP's post describes my symptoms and frustration with this problem to a T. I've been dealing with this mystery condition for 14 years. I have been to ENTs, dentists, and GI doctors and nothing has ever come close to a diagnosis, much less a cure. When I told a GI doctor, with much humiliation, about this problem, she dismissed me with, "that's not important to me." Fine, but it's sure as hell important to me!

With respect to the replies here, one of the most frustrating part is the most common responses revolving around halitosis. But it's not halitosis as we know it. It's not eating a garlic burger or neglecting dental hygiene. Of course, I have halitosis when I don't brush my teeth or eating 10 garlic pieces. No, what is perplexing is that I will be talking to someone normally and for long periods, everything is fine and then all of the sudden, the person will jerk back. And I know it's a fart breath has wafted out. That's as plainly as I can describe it. Sometimes I can smell it and sometimes I can't. When I do, I can't believe how foul it is. And it happens when I'm not talking or doing anything so that's why I don't think it's oral and that it is further down. As the OP posted, it is intermittent fecal/sulfur breath and it pops up randomly. It has destroyed my self esteem and greatly affected my social life and career. It's horrible to hear people ask if someone shat. The most recent example was a guy saying, "it smells like gas here, I'm moving away" while I was in a group conversation.

Done all the GI tests, taken all the acid reflux meds, done all the ENT sprays, tried every mineral and supplement, acupuncture, chinese medicine, etc. Everything under the sun. Everything that has listed here in the replies and yet, this problem persists. It's been 14 years and I miss that outgoing, intrepid person I used to be. Now I stay at a job I hate mainly because I can work from home. I want to look for a new job but dread going out there for interviews and having this issue pop up. It's intermittent and it happens throughout everyday.