Your history gives an impression of chronic allergy. Pertaining to your nasal complaints, any medicines ( Duonase nasal spray 2 puffs twice daily + tab Allegra M once at night) one uses can only tone down or temporarily provide relief from symptoms. Identifying and keeping away from the triggering allergens is of prime importance.
Next Steps
use the above medication for a month continuously with strict non exposure to dust/pollen, strong odours and pet hair. also avoid consuming cold foods.
Health Tips
if there is no improvement or a relapse, given the length of your history you may be advised allergy test in a proper allergy clinic and further treatment therafter.