Report This Post (To report rule violations to admin) What Do You Eat When You Have An Upset Stomach in Coping with Celiac Disease Posted June 11, 2012 Sorry that happened! I like white rice with just a little salt and butter or olive oil. Mashed potatoes or polenta/grits. You could also eat a baked potato or spagetti squash. I also agree with the gluten-free pretzels. I can't tell them from regular pretzels and would eat them everyday if they were good for me. I also drink gallons of mint tea. Pepto Bismal also works for me in the early stages if I'm queasy with an upset stomach. When I start to feel better, I eat gluten-free mac-n-cheese, but that's not good if you're still heeling and might have trouble with dairy and/or fat.