My secret formula to combat gas and bloating is:
right before dinner, I take 1 Culturelle, and eat 1-2 minced raw garlic bulbs.
After my lap chole in february, i had awful gas/bloating/stinky flatulence.
I am convinced it was bacterial (all the antibiotics i was on pre-op probably killed my good bacteria, and everything was out of wack).
Anyhow, raw garlic and Culturelle: I swear by this!