What is the best thingbtobdo for runny nose, watery eyes, and sneezing?

See an allergist: Your symptoms strongly suggest environmental allergy. Stay indoors as much as you can, drive with closed window and recirculate air, at home close windows. You can take otc anti-histamines, such as cetirizine, fexofenadine of loratadine; irrigate nose with saline, artifiical tears to eyes and drops such as ketotifen. If all these don't help, see an allergist.

Consider allergy med: Entering the spring season, it sounds like the cardinal signs of allergies. When the pollen picks up it triggers histamine release in your eyes and nose. Histamine causes the itch in your eyes and sneezing. It also causes increased mucus secretions and water eyes. You could try over-the-counter meds but these only treat the symptoms and you have to take them every day. Go see an allergist.