@chrisinbama: Get the doctor to sample the thick mucus and send to the lab for testing. For 10 months, I've been dealing with an undiagnosed sinus congestion, described as above. ENT sent me for surgery, but within three weeks, the full symptoms re-appeared. He was an idiot, frankly wrong.
Up to that time, there were no lab tests, so I demanded blood and mucus lab tests from my GP. He was doubtful. Results came back and he was shocked with the positive result for heavy staph aureus infection. It all makes sense now. Along with the described symptoms, I also have heavy ear pressure and tinnitus. Its terrible. Hopefully, the antibiotic course will clear this up, albeit, very slowly, not nearly fast enough. Still, at last, I have a diagnosis.