Grace,
I would recommend that you see your eye doctor, your primary care physician or an allergist. They do have several different drops available if it is just allergy related, but you need to rule out that there is not anything else going on. Remember, we are not medical professionals, just volunteers. If you wear contacts, I would take them out and wear your glasses until you see a doctor. I know that's no fun.
Please let us know what you find out.
Carla