Hi. Thanks for your query. Noted the history about your son and understood the concerns. Nausea that is feeling of vomiting while eating food or taking dessert indicates a problem with stomach like gastritis or small stomach or outlet obstruction may be due to ulcer, fibrosis and so on. Hence I would advise you the following in such a situation: Get barium studies done and go fr an upper GI Endoscopy as these will show the correct diagnosis and gives a plan for appropriate management Also have to find out whether any specific foods or beverages cause the problems and stop these altogether. Also go for the tests of blood and stool. Thyroid functions, liver function and tests of blood are necessary. May be a psychological problem has to be ruled out if all the tests and clinical evaluation are normal.