Doesn't it amaze you at the crap that comes out of your sinuses & lungs when you quit smoking?
Something you can do for the sinuses (it's totally gross), is flush them with warm salty water. Get yourself a really big rubber ear dropper. Mix some warm salt water (not too salty or it will burn too much), then use the dropper to shoot water (with considerable force) up one nostril. It will blow the gunk out of your sinuses and out the other nostril. Do both sides.
I had nasal surgery and was perscribed this procedure and do it when my allergies are really acting up. It cleans them out and clears your head for several hours in my case, a couple of days in some others.