Chronic sinusitis can be a sign of allergies that are out of control. There are ways to get the mucus under control, but if you're still uncomfortable, it's best to see an allergist who can pinpoint your allergies and perhaps start you on allergy shots. I've had to go through this myself several times.
In the meantime, here are some things to get the mucus under control-
I have used all of them at one time or other.
Give up all dairy. You will notice a big difference in 2 - 3 days. Besides milk, that includes pizza, yogurt, cottage cheese, puddings, etc.
Try rice milk or almond milk instead.
I gave up dairy products 20 years ago.
Use a neti pot with saline once or twice day. In between times, use a saline nasal spray to keep your nasal passages clean. My allergist carried a bottle in her pocket for use during the day.
You can make a vapor tent by adding a few drops of essential oils like eucalyptus, rosemary, lavender or mint to steaming water in a pan on your kitchen stove. Put a towel over your head and inhale the vapor. Keep a Kleenex box nearby because this will dislodge a lot of stuff.
This is the home run that will have you jumping with joy: Take this
on an empty stomach (I usually take this once a day in the morning):
http://www.amazon.com/Doctors-Best-Serrapeptase-Units-90-Count/dp/B000EDCJ3Y
This dissolves and breaks up the mucus. Have more Kleenex on hand. Serrapeptase is known as a protease. It dissolves protein that is holding the mucus together. There are other brands available that will probably work just fine, but I can vouch for this one.
There are a couple of things to consider when you're wondering if you should go to the doctor
right away or if you should just sit tight.
1. Fever - not a good sign.
2. When you bend forward from the waist does that increase the sensation of pressure in your forehead and make it hurt?
3. What is the color of the mucus? Honey-colored or bloody is not good.
Here's a good article:
http://www.wikihow.com/Find-Out-if-You-Have-a-Sinus-Infection
When I was first ill with CFS I was making every attempt to stay employed and I'd go to work feeling like crap. I didn't realize I had a sinus infection until I took one dose of Bactrim (to avoid post-coital UTI) and my sinuses started breaking up tons of mucus while I was at work. It actually felt good to get rid of all that junk in my nose! I called my doctor's office and explained what happened and they started me on abx without making me come in. (I'd been in many times recently so they knew I was sick with CFS anyway.)