Hello and thanks for writing in at HCM
It seems that your son is suffering from Gastroenteritis
may be due to food poisoning. Needs to be rule out GERD. To get rid from it consult your doctor and take i.v. antiementic drug and than orally to avoid recurrent vomiting. Along with this take a course of antibiotic.
Keep your son hydrated, give only boiled or RO filtered water with electrolyte powder.
Give only fresh food or juice (semiliquid or liquid which is easy to digest)
if fever occur.
If vomiting does't stop than admit him in hospital so that IV fluid be given to over come dehydration
. Also IV antibiotic
has more effect than oral.
Hope this will help you