Additionally, you may need a different antibiotic or to stay on it longer. If allergy is the problem, avoidance of known triggers decreases nasal congestion which leads to poor drainage of the sinuses. 

Self-help ideas

• Avoid smoke, a potent irritant to the sinuses, and exposure to upper respiratory infections, including the common cold. 
• When you are having an acute flare of sinusitis, avoid airplane travel and bending over with your head down as either can increase sinus pain. 
• Apply warm facial packs or inhale steam. 
• Drink plenty of liquids to help dilute nasal secretions. 
• Humidification in the bedroom at night, when the heat is on, or an over-the-counter topical nasal moisturizer decreases drying and further irritation.
• Occasional use of an over-the-counter decongestant nasal spray, such as Afrin®, gives temporary relief but will worsen the condition if used more than a few days in a row.