You can self treat and get rid of a sinus infection at home by rinsing out your nasal passages with a saline solution using a Neti Pot.
Sleeping with your head elevated and applying a warm compress to your face can also clear up a sinus infection as well as taking a steamy hot shower or letting the shower run on just hot water and let it steam up the bathroom while you sit in the bathroom and take in the steam.
Keeping your home and bedroom moist using a Humidifier or Vaporizer can help clear up your sinuses as well.
Spicy foods can clear sinuses up as well if you like and can stand spicy foods. Jalapeno peppers are a really good food to eat which can open your sinuses quickly.