Finely dice an onion and mix it with 1 cup buttermilk along with ¼ teaspoon black pepper (kali mirch) powder and drink.
Regularly intake garlic (lahsun) cloves for a few days.
Regularly intake coriander (dhania) decoction made by boiling 2 teaspoon dry seed powder in 1 cup water. (Milk and sugar can be added to improve its taste. This could be a welcome substitute for tea or coffee.)