Freya, just a couple of things that I've found helpful...
the BEST thing that I've found for my sinuses is ghee. I live in a VERY dry, dusty area(high desert) and sinuses have been an issue for a while now. My nasal passages have gotten so dry that they crack.
So, ghee:) Watcha do is this...warm, liquified ghee. lay down, take eyedropper and pour the ghee up the nose. Let it saturate.
*grossness ahead* the ghee seems to liquify the dried-on crusty bits. IT also soothes tortured sinus membranes and nasal passages.
Also...IF you are suffering "detox", coffee enema works like a charm.