You could try doing a Sinus Rinse (Nasal Irrigation) for a few days – it’s worked for me, and for many others. The info below is gathered from a couple of different websites:
Sinus rinses with a warm saline water rinse may promote drainage of the sinuses and speed healing of inflamed tissues. There are a number of devices that can be used for the sinus rinse, including powered irrigation systems like a water-pick with a soft, rubber-tip attachment that is placed on the nasal opening, to traditional devices like the Indian neti pot. Similarly, there are also a number of liquid formulas which can be used in the irrigation.
I just mix the following together and use a baby's ear syringe:
lukewarm distilled water or boiled tap water that has cooled off and is lukewarm
some sea salt
a small bit of baking soda
Lean forward over the sink, face down with chin tucked to the chest. Squeeze air out of a baby's ear syringe or similar device and squirt the salt solution into the nasal and sinus cavity aiming for the back of your head not the top. Allow this to drain out and repeat through other nostril. Repeat procedure for two to five minute alternating nasal passages
You can do this as often as you like really. And once to twice a day is a good start. Adjust the salt content if you find it too strong at first.
This works in a couple of ways... The rinse actually helps get rid of allergens in your sinuses thereby reducing any allergy based response in your sinuses. It also simply rinses out the mucous that may be in there. And the high saline content actually works to help reduce any swelling of the sinus tissues.
This procedure should not make you cough, choke, or cause pain. The saline should enter the nasal passage, travel to sinus passages and come out the nasal passage. If saline is entering the back of the throat, you should lean forward further over the sink and repeat the work "CLICK" which closes the palate preventing the saline from passing from the nose to the back of the throat.