hi there, this has been going on for years, and i have just learned to live with it, but i am getting sick of it, i dunno whats wrong, its like theres a valve in my nose somewhere that is open, and should be closed, because there is a constent slow moving stream of gross flem on the back of my throat. it drys up sometimes and hurts, i sometimes scrap it off, but only to hurt it more. i dunno what to do, help please