How long does the gas last? I feel like I'm always walking around needing to burp or heaven forbide...fart!! i took some Gas x today and went for a walk...I feel a little better. I'm ready to EAT! I am sooo hungry (and by that I mean mentally hungry?!) for popcorn and white cake with white, frosting and coconut (picture a pepperidge farm cake)..ahhhhhhhh