Jake,
There is an organization called the Cyclic Vomiting Syndrome Foundation. You should be able to find its website by doing a search on Cyclic Vomiting Syndrome. When you had the endoscopy, did they specifically look for something called eocinophils (sp?)? If a person has true food allergies, the level of these cells is usually high. When my son was ill, we took him to Johns Hopkins to be evaluated by pediatric GI's, allergists, ENT's. The GI doctor there at the time was involved in a grant to study delayed pattern food allery that was causing CVS-like symptoms. Our son was there at the right time. The grant expired, and I've never heard anything more about the connection between delayed pattern food allergy and CVS. The doctor is no longer at Hopkins, but I did run into him several years ago (he now works at a hospital in VA). He told me that whenever he gets a new patient with CVS symptoms, he always examines the delayed pattern food allergy possibility. I know of no other doctors who do. I can tell you that allergy testing (both skin and blood) yielded no results because they only pick on immediate allergic reactions. The theory on delayed pattern food allergy is that the person can tolerate small amounts of the allergic food with no immediate reaction. However, if the food is consumed consistently over time, it can build up to a point of toxicity. That is when the person becomes violently ill with vomiting for however long it takes until the "toxin" is fully expelled. Then the person is fine...until the next time. The hard part is trying to find out what the person is allergic to. We were lucky, our son was very young and not consuming many different foods. As the food he was allergic to was consumed less frequently, the episodes between sick periods became longer. Once the food (it did take months to figure out what it was) was no longer consumed, he never threw up for that reason again. I've checked over the years to see what progress has been made on the causes of and treatment for CVS. Please keep me posted on how you're doing--I know it's not an easy existence--I watched someone live through it. Be strong!