Respected User, hi I evaluated your query thoroughly. *Related to Gastric upset due to variety of issues ranging from infection/PH imbalance problems / any other underlying pathology needing evaluation. *Avoid excess oily / spicy / nonveg / excess ghee / cheese / beverages. *Avoid smoking / alcohol. *Avoid stress/ anxiety. *Regular exercise , stretch outs , YOGA. *Have small amounts of food at intervals. *Avoid prolong fasting / overeating. *Fix timing of breakfast, lunch , dinner. *Don`t allow to sleep for atleast 2 hours after lunch / dinner. *have adequate sleep of 8 hours. *Maintain his hydration with plenty of liquids - preferably boiled water, coconut water, home made juices, butter milk etc. *Maintain his weight chart. *To improve digestion more green leafy vegetables, fruits (organic), cereals pulses, legumes, curd help. *Ayurvedic preparations of Triphla & ambla are also good for digestion. *In our clinic we recommend Proton Pump Inhibitor molecules along with Anti-emetics to be taken 1 hour prior to food. *In case he may require physical examination, certain tests also if necessary Hope this clears your query. Thanks for using Health Care Magic & keeping trust in our medical services. Regards. Wishing your son fast and speedy recovery from the same. Bye dear take care of him.