It was pneumonia that 'gave' me my severe PN! I had it for over two months!
The phlegm thing? Yeah, understand, you cough or blow yer nose and then check the color and quality of the stuff! If there were only some way we could make a commercial GLUE out of it we'd be rich! NO? Durn it? We all could USE to be RICH!
Watch the humidity level where you live and work, super dry makes more gunk. Steamy showers are good, but I often take a lite dish towel or wash cloth and keep it near my head when I sleep or at home, sort of a micro-environment? Seems to help and keep the pressures on the sinuses down.
I've not tried the Mucinex, tho maybe I should? But I've found that taking decongestants can help...OR can just make the gunk thicker. Pick your choice? Try things, whatever works is GOOD, discard the rest!
Just don't be more than three feet from a Kleenex box! Hopeing it clears up soon! 's and Lots of GOOD thoughts! - j