Yes, multiple GI and ENT doctors--both giving me scopes of my digestive track and my nasal system. Each time, the results are that I have some acid reflux and yes, post nasal drip that they can't figure out the cause so they just term it sinusitis. But nothing in the tests explains the sulfur odor. Worst of all is the doctors don't even want to address the problem. One doctor literally told me it wasn't important to her.

Since I'm social distancing and live alone, I decided to do something I've avoided for the last 15 years--eat lots of garlic. A little experimentation to see how much it affects me. Started this morning and I can now smell the fart-like odor coming up my mouth and nose.

The doctors can't or won't diagnose it but the only thing I can think of at this point is that there are valves in my body that open up or are open that should not and odors that belong in my intestines are released. I don't think it's dental related because the odors waft up even when I'm not using my mouth--talking, eating, etc. I can be perfectly still and a sulfur odor will escape. Frankly the most direct way to describe it is like I'm silently farting from my mouth.

PS adding that while certain foods will trigger my acid reflux--the sulfur bomb breaths happen regardless of what I eat or don't eat. It doesn't matter if I'm full or starving. It's frustrating that years and years of taking medication and eating to take care of the acid reflux seems to have little effect on the bad odor.