Another possible harmless remedy comes from the Yoga technique of Neti (sp?), it is a special pottery pot with a spout that you put warm saline water in, lean way over a bath and tilt your head just so, then you pour the warm salty water in one nostril and it comes out the other (TMI I know). I've used this technique for years when ever I get blocked up and it really helps. Maybe you can google it?