Most would probably tell you sinus or allergy related but I do the same thing and feel the way it comes up that it's somehow related to my stomach and maybe undigested food? I get this feeling of wanting to press on the side of my throat and it's when I'm coughing and coughing. Finally, after this goop comes up, I 'm a little better. It's also after I've eaten something I shouldn't, which is all the time.
CharBerry