Dear Saurabh, hello.
Before advicing, I would like to know the characterstics of your headache- whether it is least in the morning and maximum in the late hours of the day. Most probably you are having sinusitis
as the cause of the headache.
You will get relief by inhaling steam and taking some pain killer under medical supervision. Steam will also help in relieving the nasal congestion
in your right nostril
Thanks and take care.