One thing I discovered with my Crohn's is there is a tremendous amount of pain from the gas produced and not necessarily from the Crohn's itself. But having said that, I also found that taking a probiotic in pill form, helped alot in reducing the amount of gas produced. And it had to be in the pill form and not within other products because when it's within other products, like yogurt, there isn't a high enough dose.
Try it, let me know if it works for you as it did for me!!