I thought my gas odor was because of my ass but it's coming from my head. I was diagnosed with IBS and I've had this problem since I've been lactose intolerant about 3 years ago. Doctor f**king jipped me. Take fiber and eat more vegetables. Did absolute shit. Then I saw a sight. TAKE BIOTIN. It hasn't helped my head yet, but when im really hungry and can feel my stomache eating itself there's that gassy smell again. That's disappeared with Biotin. Just get it at Wal Mart or something, 60 tablets for like $1.50. I saw some site I can give it to you that said Biotin defficiency is a problem.