I noticed that you haven't posted on the Oil Pulling forum yet. I think this would be a very good thing for you to try for your sinuses. We've had some fantastic reports of sinus health due to this therapy.
Oil Pulling is simply swishing nut or seed, expeller pressed oil around your mouth for 20 minutes each day. Oil will be absorbed into your system, and will lubricate your sinuses while giving you a dose of the good acids for your system.
People have OFTEN reported the intense draining of their sinuses after the first pull. I have experienced this myself too. It's very dry where I am right now, but the oil pulling has helped from sinuses from being too dry.
I use Sinus Buster to deliver my cayenne pepper to my sinus passages. I won't lie, it is quite intense for a few seconds. But after you spray it up there, your sinuses will be clear for a long time. It's also not habit forming, nor harmful to use for an extended period of time. You can google it.
That's my 2 cents on the subject.