Welcome to XXXXXXX
Your on having persistent running nose ,sneezing
and oughnare in favour of allergy
The problem is to find out what he is allergic to!
It is not always easy to find the allergen because it is not the food alone( which can tested),but the dust in his environment including the school,,pollen in the air ,moulds in the house ,etc.
Absence of fever supports the allergic cause .
You can try a few things.
1 keep his room,your house,sleeping pace,etc dust free.(from the fine dust ) you can use vacuum to clean .
2- do not use powder,sprays in his vicinity.
3-avoid citrus fruits like oranges and lemon - in some it helps
4.look for an allergen- that causes his sneezing to aggravate or start.
5 avoid passive smoking
By medicines you can try a course of a medicine called Montek
LC KID for a period of 1 year .
It contains anti histamine
plus a drug to prevent allergy.
You might have tried that earlier as this is widely used in India.
As he grows he will be better.!!