I just went through a problem with that, and it seemed it would happen right after I ate. The doctor even thought it was my Gallbladder. I had posted on it a few months ago. It was happening every day for weeks, and I did get relief with regular old Alka-Seltzer. It finally just stopped. I am trying to eat slower and drink water with my meals to help digest my food better too. I was put on a new medication prior to all this starting, and now my doctor thinks I might have just been adjusting to the new drug. Hope you get some relief. I never tryed it, but a friend of mine swears by Mylanta for her gas pains.
I did notice now that I have gotten older that I just cannot eat the things I used to.