My 12 year old son, has had a stomach bug since last Wednesday. The last time he vomited and had diarrhea was 48 hours ago. He was able to eat some mild foods yesterday (it's 3am right now). Off and on throughout the duration of his symptoms he has had some gas that has an unusually pungent odor. It smells like an animal died inside of him and has a sulfer aspect to the odor, but worse. He woke up a little while ago and crawled in bed with my husband and me, and the odor filled our room though he had gone under the covers. The first time I recall smelling this odor was when he belched the Tuesday evening before he started vomiting. I remember thinking he passed gas, but he told me it was a burp. Then he belched a lot more that evening and it had that same smell.