Hi
It might well be a viral
diarrhea. Usually they resolve within 5 to 7 days.
The term `hard swollen stomach' concerns me. If so please have him checked again.
Since you say its already 8 days, its better that you have his stool examined in a lab- Routine examination and for reducing substances. After you get the results, you may discuss it with your doctor.
In the mean time avoid milk and milk products in his diet.
Include plenty of curd, Rice based items, Banana, boiled potatoes, Bread in his diet.
To prevent
dehydration, you must give him plenty of fluids like water, coconut water, soups, porridge,
ORS etc.
You must ensure that he passes urine atleast 4 to 5 times in a day.
Hope my answer helps.
Wish your son a speedy recovery.