Have you tried a neti pot?
Neti pot - Wikipedia, the free encyclopedia
Seriously. This thing will rinse all the gunk out of your sinuses and nose. Given where you live I would use distilled water in the neti pot (chlorine can cause a burning sensation). You might also want to add salt. Don't use table salt with iodine--use a sea salt or kosher salt, about 1 tsp. per 2 cups of water. They also sell premeasured packets of salts for use in a neti pot. You also want the water to be about body temperature. I put the distilled water in a liquid measuring cup and microwave it for about 50 seconds, which gives me water near 98 degrees (I used a candy thermometer to measure the temperature of the water the first couple times).
And if you can find Traditional Medicinals teas, they sell a cold care variety pack that has a bunch of herbal teas my SO and I love when we're sick.
Especially this one:
This is another beverage we're a fan of when we're ill:
Basically, rinse your sinuses out regularly, drown yourself in liquids, and rest up--you'll be better in no time.