I had similar issues with my sinus getting blocked, a friend of mine told me that her ob said that sometimes it can be a sign of dehydration (earaches too) so to up my water intake, which worked. I also went to a chiropractor who showed me certain pressure points on my face to apply pressure to which had amazing results, it seriously helped clear my sinus up. Now whenever I start feeling that heavy feeling in my nose I start pressing those points and it clears up.