I often get gas from mysterious foods...?

Sometimes I get terrible gas from certain food- I can't seem to pinpoint it; although it seems to be from cabbage... But sometimes I eat cabbage with no gas resulting. When I get it, it feels awful, like something is churning in my intestines, and I feel very full like I want to burp and flatulate for a long time! (sorry if that's gross). Anything I can do to help with this? When it occurs, I can't concentrate on anything else b/c it's so annoying or hurts so much. I hate having gas. What kinds of food help with it? Any medicines that work especially well? Please give your experience on this. Thanks!