i have a constant sensation like there s this thick, mucousy substance caught in the very back of my throat, and when i swallow it goes away for a couple minutes but it comes back no matter what i do. i eat, and drink, and rub my face & neck to try and rid myself of it, to no avail. I ve done a little research and it s said to have to do with the sternocleidomastoid but i just want an understandable explanation of the causes and symptoms, and how to make it stop.