I have suffered from horrible cold allergies all my life.
Prolonged usage of anti biotics would give only temporary relief.
I started taking a "Kaada" type tea that would decrease my symptoms.
In one cup of water, while boiling add 1 teaspoon tea, 4-5 tulsi leaves, 2 peppercorns, 1 clove , 1/2 inch grated ginger, 2 small elachis.
Boil to half quantity.
Add milk and 1 teaspoon honey at last.
Sieve and have hot.
Adjust sweetness as per choice.