Experiencing abnormal passing of gas with an odor of rotten eggs. I had a test about 7 to 8 years ago for a similar disorder to determine if my stomach contained excess bacteria that produced excess or less hydrogen (I forgot if this was the element). It was determined that I had a bad bacteria problem and antibiotics were prescribed and that knocked the problem out. I was fine until about 2 weeks ago when I ate a large ice cream cone and this issued flared up again. I understood from my last test that bad bacteria love sugars and I'm wondered if that ice cream indulgence has kicked this issue off again in my system and I need to rid myself of the issue with antibiotics again - I rarely eat any sugary items. Anything over the counter I might try?? No abdominal pain or bloating - just this noxious gas.