I follow the diet first -- I take a soluble fiber supplement -- about 12 grams of fiber and was stable with nearly no attacks on that before I tried to tackle the gas. Then I take Digest Support - which is an enzyme with anti gas properties. I also take Natrol Bio Beads which have probiotic mix in them -- and a product called My Defense which has a standard amount of Vitamin C and a few other things and is supposed to increase healthy gut microflora.
Still if I do have a problem - it's usually the gas that comes back... like if I have something I'm not supposed to eat... like tomato sauce... too much fat... something like that. I haven't had a full attack in a long time. I think it was last September or so when I had my last big huge painful D attack.