Yhanks for query,
You have got allergic rhinitis
and unless you identify the allergen it is difficult to cure.
There are many causes of having allergy and you have to find out the allergen observing one by one by avoiding that thing.
These factors are,
Dust,weather,food like certain cereals,vegetables like bengan,tomato,cold
Cosmetics like soap,duo
spray,perfumes,some clothes,synthetics etc.
By trial and error you identify the allergen.
To know the allergen now allergy tests
are also carried out.
Ok and bye.