I have the very same symptoms, they drive me crazy! I do drink lots of water, and I just took a mucinex, hope it helps. Maybe we have a food allergy they talk about which is triggering this.
It may not be the worst and could be something quite benign - like just irritation from snoring, swallowing repeatedly, or even a small infection. But....it is worrying you enough that you should get it checked by a doctor - even if only for your own peace of mind.
Drink a lot of water to soften it up. Try mucinex. Eventually, you will cough it up. Linda