What other symptoms should I look for?
 

I'm not sure if this could be a csf leak... About 3 days ago, whenever I would bend over my nose would run like crazy, but only through my left nostril... It is still happening, and I have a tiny headache, nothing major. What other symptoms should I look for and when should I visit a doctor for this?
I'm not sick and I don't have any allergies ...

Thank you
-Melissa