What do YOU do when you have stomach inflammation?

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I have food sensitivities. Yes, yes, I know, you people with perfect genes don't believe in this, but things like Lactose Intolerance, Gluten Intolerance, and sugar sensitivity are real (I have all 3). So yeah, I had some "100% whole grain rolled oat" cereal today and my stomach is so inflamed it has me eating foods to soothe it... I took an ibuprofen about an hour ago and an allergy pill about 6 hours ago, but I am still messed up and I hurt. If any of you experience the same thing, what do you do to make it go away?