I started having eye issues a few years ago and went to the eye dr. who told me it was "eye allergies". I used prescription eye drops for about a year and then he told me that two OTC drops (with the exact same ingredients) were now on the shelves. Zaditor and Alaway. Ketotifen is the ingredient that you want to look for. It has made a world of difference for me! Here's a link to a coupon for Alaway....
Alaway Antihistamine Eye Drops
Hope it's just allergies!