Drinking eight to ten glasses of water each day, inhaling steam, and adding a humidifier to your living or sleeping space will all help. In addition to keeping your house clean, you might try a HEPA filter for your bedroom. Although food allergies are not a main cause of chronic sinusitis, people with severe problems may want to try eliminating a few foods to see if things improve. Dairy and wheat are two of the most likely culprits. But remember, since foods are not usually the main cause of the problems, you should add them back if things don't improve after a few weeks.
People often try a variety of herbal remedies.
Some research suggests that stinging nettle and bromelain both may work. They probably are your best bets if you want to try dietary supplements. Vitamin supplements are probably unnecessary if you eat a diet rich in fruits and vegetables. Remember to eat five or more servings of fruits and vegetables a day. This gives you some things to start with.