I have posted the one where it says am i doing the right thing, if you read it it may help, but i'm suffering from the exact same thing! I get it every year!
I had to go to the Dr as i'm Asthmatic so it can get quite bad for me. Basically you can go without going to the Drs and suffer with it, Or the Dr will give you a weeks course of Antibiotics. It bugs me so i have to get some AntiB's to help clear it quicker, it's a virus i think but can go away on it's own if you can bare with it.
Hope this helps, Bare with it you'll be ok soon! Good luck to you!