What Causes Oozing Eyes Followed By Headache And Tightness In Neck?

3yr 8month old who has a sand pit at Pre school, paints, plays outdoor with other kids with trees, squirrels near by, etc., contracted oozing eye over last 48 hrs, got Gentamicin Sulfate drops after putting them in yesterday oozing stop and already looks to be clearing up but have to use for 7days, has energy, eating but after running around today complained of head hurting and points to the back of his head and also says his neck is tight, no sore throat tho and only has reaction to Peanut butter. Possible concern of a form of meningitis?, or what could that be?, he has no fever, constipation, vomiting etc, has been eating regularly Please advise