my eyes have been watering all day and are now very sore.
It could be so many things, so I can't really say. Maybe the cold? I agree you should go with calling your ophthalmologist and have him/her check them out if your eyes are still sore and watering tomorrow.
The only other thing I can think of is sometimes excessive watering is a symptom of Dry Eye Syndrome. I know it sounds contradictory but dry eyes sometimes go into tearing overdrive.