Ask an Eye Doctor and Get an Answer ASAP
Since it is watery, it could be viral infection. But it could be allergy. You should see your doctor. If it is allergy, s/he will prescribe medications that help control allergic reactions and inflammation. If it is viral infection, your symptoms will likely clear up in one to two weeks.
It doesn't seem to be viral infection. You can take Benadryl. You can also use over-the-counter topical antihistamine/mast-cell stabilizer combinations (eye drop) such as Alaway (Bausch + Lomb), Claritin Eye (Schering-Plough), Refresh Eye Itch Relief (Allergan), Visine All Day Itch Relief (McNeil) and Zaditor (Novartis). It works faster than oral medications.