The best advice I can give is to try a few different things. Dr. Mercola's video on enzymes is first rate!
I have found great success using (a) Beano, (b) Twin Lab Super Enzyme. All you have to do is remember to take them before eating!
I am also going to try Bentonite Clay.
My naturopath says never mix proteins with starch when eating and eat three squares instead of 'nibbling all day' to help gas & digestion.
I am also trying DetoxiFiber from Garden Of Life - daily spoonful - highly recommended from a naturopath.
Good luck!
Alex