While working today (I stock groceries in a local store), I noticed that occasionally when bending over straining, that a clear fluid drains out of my left nostril only. I ve done a little reading on the matter, and I am terrified that it may be something serious such as a CSF leak. I went into the bathroom a couple of times to try to blow my nose (I have pretty bad sinuses usually), but every time, my left nostril appears to be free of any obstructions. A drop did go into my mouth when I tilted my head back to stop the leak, and it was pretty salty. Any ideas?