Thick Phlegm in my throat? tmi sorry?

Ok so here is the deal- from time to time, about 3/4 days of the week, i have this THICK mucus in the back of my throat.. Ive tried to swallow it away, cough, snort, anything! nothing works... its so thick i can hardly breathe sometimes...it feels like elmers glue in the throat.. i know this is gross and im sorry- but someone please tell me how to get rid of this!!!