i cough often and sometimes I throw up foam, or have mucus that won't come out, holding things in my throat. Tonight, I had, what looked like butter from movie popcorn, come up my throat and out of my nose as well. What could be causing this? i have the sensation of something lodged there most of the time, my pills get stuck in the same place. i have had an endoscopic exam, etc. I am told I have goiters...