If your sinus infection lasts longer than 2 weeks or seems to get worse then it would be a good idea to see a doctor or go to urgent care to have the sinus infection checked out.
The doctor or urgent care can get you on some antibiotics and provide some better treatment for your sinus infection.
Most times though sinus infections go away without treatment or antibiotics within a few weeks but sometimes you might have a more severe sinus infection that could require medical treatment for it to go away.
For at home treatment I recommend using some over the counter sinus medications, a neti pot, some steam from a shower, a humidifier, drink plenty of water or other hydrating fluids and get plenty of rest.