The number one top thing you can do is lavage your nose with saline. You can make your own by using 1/8 teaspoon of salt per 8 oz (cup), boiling it 3 minutes, letting it cool to room temp and using it often as you wish to rinse your nose passages. It will reduce inflammation, has no side effects, and will wash out allergens that may be making things worse.
If your sinus drainage is bloody, see a doctor for an antibiotic.
Consider an anti-histamine such as Claritin (generic is fine and cheaper) available over the counter and a decongestant also available at the drug store.
Drink plenty, make sure you have moisture in the air of your house, especially where you sleep (a cool mist humidifier is good).
Consider an air cleaner for your bedroom to reduce air irritants.
And lastly consider an anti-inflammatory medication like ibuprofen, as directed.
Warm, moist clothes applied over the face can help as well.
You can buy Saline mist at the drug store for $3, then refill the bottle with your own as described above. Use it often.
Sleep with your head elevated to promote drainage.
If none of that is helpful after a week, see a doctor and consider a nasal steroid spray such as Flonase or Rhinocort, available with a prescription and Allegra.
I like the saline wash the best because it does nothing more than help, is proven as effective as prescription nasal steroid sprays, and has no adverse effects.
Good luck. Hope this helps.
Son has horrid sinus issues