my boys would get like that at least once s year...Let him sip on water if he throws up..keep having him sip water until he holds it down. Then give him pedialite and then try crackers. Keep that up as long as he doesn't throw up and then give him some chicken noodle soup. Then fruit and jello. Slowly give solids as long as he isn't throwing up.

give him lots of Gatorade or pedialite it will help and try chunky chicken noodle soup or just chicken broth.

Will he drink? Give him a bottle of pedialite Itll hydrate him and give him calories until you can get him to stomach food