I know what you're talking about. I went to a Gastroentorlogist and she prescribed Levbid for the pain, she explained that (bear with me, I'll try to make sense as best as I can) there is a chemical that your brain produces that masks the feeling of gasious movement in my intestines and that I lacked this chemical. So a gas bubble, the size of pea, would feel like a gas explosion making it's way down just before the big "D" hits which could take anywhere from 20 min to 2-3 hours depending on how fast this bubble travels.In short the Levbid did help me tremendously. hopefully you can find one (Gastro M.D.) that will help you. Don't be satisfied with one that tells you there is nothing they can do, that is simply not true!Best of luck to you.