Whenever I have an intense BJJ session for my competition class (2+ hours), I get really bad stomach acid. It feels like I might need to puke, but HOURS after, I get bad heartburn. It sometimes last a day or two. Anyone else get this problem? Pepto and Tums do NOTHING for it. Is there anything I can do to prevent it? I usually eat yogurt or pudding about an hour before I go, that way I don't puke.