Well, generally speaking, there are many reasons which can lead to the hurt on the bottom of your eyes. For example, if you go outside, the light is so strong that when we open our eyes to see it. In that way, it will just make the eyes hurt. And also, our eyes are so very sensitive that they will react to the stimulation from sun light. So when the sunlight gets into our eyes, it will make our eyes to adjust to it. Sometimes, it will also make your eyes not just hurt, but also become watery. So at this moment, you’d better wear sunglasses to protect your eyes from the strong light and the UV rays. By the way, it also can be because of the eye infection, for there are many dirty objects in the air outside. Just be careful about it. For your situation, you should go and see the eye doctor as soon as possible.