I have been diagnosed with Celiac about 6 years ago...just recently in the past three months I ate a piece of cake that was supposedly gluten free and it was total wheat flour (!) and I had the vomiting thing for hours and felt miserable and shaky for about 10 hours after. Just the worst. Then, yesterday I had Lay's Sour Cream and Onion potato chips and was very sick for many hours, starting with dizziness and head feeling weird. The vomiting thing is new for me and I am usually so careful, so discouraging. Just was looking to see if others experience the vomiting thing as well...thanks for your post, I know I am not the only one and it isn't Something Else. Thanks!