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The problems you list in this question seem to go way beyond the scope of this Web site.   I'm not sure anyone could answer all of these issues properly. We have some great resources on acid reflux/GERD in children and teens on our acid reflux site. Take a look here.   You may also want to try our partner site, www.reflux.org, where they have a huge message board where people post questions about children's diets, vomiting, acid reflux and more.   As for the possibility of food allergies, check out our page on the food allergy basics, where you will find information about the most common food allergens and foods where they may be lurking. You will need a doctor to do allergy tests and such to diagnose a food allergy. You won't be able to figure that out on your own.