Take quite a few thousand milligrams of vitamin C off an on through out the day. Probably day two or three thousand every two hours about four times during the day until it clears up. It won't take long trust me. Drink cold care herbal tea's with mint extract in it, like echinacea, you can even put the vitamin C in the echinacea tea. Those two things are both great for your immune system and for clearing up colds or sinus things. Darrean is right, oil of oregano is good. Then you get boil a pot of water, add drops of mint extract, turn the pot off, put your head over the pot and cover your head and pot with a towel.
Get a humidifier, and seriously, don't use the allergy medications anymore! :) Hope that helped some.
1: Get a humidifier. 2: If a humidifier isn't an option, place a large bowl of water in front/on top of your heating vent. 3: Take a hot shower without the fan on. 4: Fill a bowl or sink with hot water and sit/stand over it with your face slightly in it and a towel over your head and the bowl.