Why have I had potent gas for over a year?

My friends and family cannot stand to be around me when I fart. The fart is usually silent but the smell is so strong and quite deadly. I went to the doctors and had my feces tested and everything came back normal. She asked me to go on a non dairy diet and I still had gas. Some of my friends say it is because I... show more My friends and family cannot stand to be around me when I fart. The fart is usually silent but the smell is so strong and quite deadly. I went to the doctors and had my feces tested and everything came back normal. She asked me to go on a non dairy diet and I still had gas. Some of my friends say it is because I eat vegetables and fiber often but I think this is perfectly normal. Does anyone else have bad gas, mostly in the evening? I forgot to mention that I have diarrhea and loose stools almost every morning. I have no idea what is going on and why my body is acting this way! Please help!
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