Have you eaten any eggs when this happens? The reason I ask is because sometimes if we are allergic to a food, our digestive system does not work as well as it should and the food can possibly ferment. I would see a doctor if this keeps up and inquire about having some food allergy tests.
It could be due to what you eat or the acid in your stomach. If you are concerned, you should see a doctor. He can test to make sure you do not have a bacteria in your stomach causing this.
Hi and Welcome,
I don't know .. rotten eggs seems sulphur based.
C~