Hi My Grandson Is 15 He Has Been Sick For

hi my grandson is 15 he has been sick for 6 days he was eating bufflo hot wings he got sick and felt like he was going to throw up and has been nausea cant eat very much pain is on both sides under ribs he had blood work up at dr office they said no infection and kidney were fine . he has a lot of gas and belching feel nausea all the time he has eat jello apple sauce . they gave him prilsept and Zofran .