For a while ive had this feeling in the back of my throat (like if your put your finger on the roof of your mouth and went back a couple inches). It feels like I need to cough up a big wad of phlem, but there is never anything. Sometimes at night i can have a little trouble swallowing, and a lot of the time my mouth is dry. It is getting very annoying especially when im trying to sleep. Any answers would be greatly appreciated.