persistent cough

Hi, I just got over this "bug" I had, but it left me with a persistent cough, and a post-nasal drip that is driving me crazy. I feel as though there is mucus in my bronchial tubes but it feels like it's gotten "hard", I can't seem to cough it up (or loosen it). I was thinking about taking a cough syrup to loosen it up because I can't even sleep! I don't know if that stuff is really o.k. though. Can someone help me? Rachel Tweet