@ GiraffeEars- There are a few more home treatments for chronic sinus infections. One is using a neti pot, as Comparables mentioned. Hot showers and steam also help to open airways, as do nasal sprays. Lots of rest and relaxation are also important.
Stress can drag down your immune system, so rest will help your immune system recover, speeding up healing time. People who have to work through illnesses often have symptoms that linger.