Coughing up... Bogies?? (Gross)

For months now I keep feeling like I'm drowning/choking on phlegm. I'm certain it's draining into my throat from my nose rather than my chest. I am constantly having to snort to clear it out and on the rare occasion I get some of it out it looks like this... With hard chunks like bogies??

I've seen an ENT specialist who said he saw no signs of infection but couldn't get me out of his office quick enough. What could this be it's making me miserable!!!