He seems to have stomach infection
. Give him plently of liquids like lemon water, fruit juices, coffee etc.If has vomiting
sensation give him in small portions.Give him apple, pomegranate to eat, you can also give jello, curd rice like things to it.you need to give some tablets for fever like paracetamol
for vomiting thrice daily. This should work if not go and see a doctor for antibiotics.