De-Gas tablets work a treat for me. They are natural, peppermint oil tablets which help to settle your gut and pop the bubbles...which may result in farts and or burps You can get them at most supermarkets in the medicine section.

Peppermint tea also helps and, this will sound very random, but if you think it's a fart then you could try laying on all fours and sticking your bum up in the air. It seems to work!