My 7 year son vomiting lots of time then yellow colour vomit ,after green colour, he is admitted in hospital from last 3 days its happened 12 to 15 times in last 4 years same problem happened again & again all blood test x ray sonography barium x ray urine culture routine also normal his wt is 12.5 kg not gain from last 3 years doctor admitted & treatment IV ondem inn,rantact,rl, also syrup,mucaine gel,viz lac, sucrafil,tablet domestal,Jr lanzol, what is the exact problem now doctor suggest yo do endoscopy.....pl help why this happened again & again