OH! And my friends think I'm crazy when I tell them I get sores in my mouth from eating acidic foods (oranges etc). I haven't had too much problems until this constant clearing. Now I can almost guarantee that it's going to happen.
I also started using a sinus irrigation system (salt water). That has done wonders for me. I haven't had to spray my nose with Afrin (the only other thing I found to work at night and my dr said no no no). However, I noticed after I use the irrigation system, my left sinus cavity holds the water. I can blow my nose after I irrigate but it's not until 5 minutes later that I lay down or bend over that the water will drain. Again, only on the left side.