tdonline- I wish I could be of more help to you. Keep reading and keep searching for answers.
I do understand about the death breath. I have lived with bad breath for a long time, always reaching for gum and mints or just mumbling under my breath.
I also have a burning/stinging sensation at the back of my mouth quite often. Sometimes it is after heavy meals, sometimes it is not.
I have had 3 endoscopies, two of which showed gastritis and the last one seemingly 'normal'. I had been on Aciphex about 3 months before the last test so the doctor suggested I stay on it.
He said we could also do that test for acid where one goes around with a tube in the nose.
Even though my stomach now seems OK itself, I know I have some kind of reflux. It may be from the stomach or small intestine, but I know something causes the odor and the burning.
Why not consult your doctor and try a low carb meal plan for a while to see if that helps? It's worth a try.
As for me, I am having difficulty getting my head on straight to be consistent about it myself.
Best wishes, Searchin'