I faced the same problem for 4 long years. Then I started taking extreme steam for 10-15 minutes, twice a day (night and morning). And believe me, my sinus problem completely disappeared dramatically within 3 days. It's been more than a week and I feel so fresh and active. It's like rebirth to me. I advice you to take hot steam 10-15 minutes in a day and see the result your self.
Pramod Singh