You may try the following home remedies
for your son's present state of sufferings to bring best possible results:
1. Add 10 drops of fresh ginger juice in half tea spoon honey and make him to lick it.
2. Boil 10 Holy Basil leaves in one litre of water and store the water in Thermos flask. Let your son drink this water only and avoid giving plain water.
3. Boil quarter tea spoon turmeric powder in a cup of milk and give him to drink once a day.
Also, take your doctor's advice and treatment besides above home remedies to keep your son healthy. Take care and God bless your family with good health!