I have periodic "attacks" where I experience nausea, burps taste of cheerios, significant pain in upper right quadrant, bloating, vomiting followed by diarrhea. I have negative ultrasound for gallstones and gallbladder reactivity is normal. Lactose intolerance test also normal. These symptoms were frequent (biweekly) in 2010 and I lost about 25 pounds. Endoscopy led to Celiac diagnosis. Eventually attacks ceased. I am 100% gluten free, but have had 4 attacks in last 3 months. GI suggests stress or sensitivity to fats.