Anyone had really painful gas?

Geez, earlier I woke up from a nap with what Im now uming was really bad gas. My stomach hurt so bad I was on the verge on tears, it went away after about an hour and 2 Tums. I knew it was contractions, because Ive had a baby before and I know what that feels like. But it took me a while to figure out it was gas because I was so frantic because of the awful pain. Anyone else had really bad gas like this?