Many people think they have "sinus problems." But chronic sinusitis is a specific condition. It's worth knowing the difference before you assume that's what you have.
Chronic sinusitis lasts 12 weeks or more. A cold that clears up in ten days is not chronic sinusitis. Seasonal allergies that come and go are not either. A doctor also needs to see real signs of it — not just symptoms you describe.
If your congestion, mucus, or face pressure has truly lasted for months, a nose exam is the best way to find out what's really going on.