For the past couple of days, my right eye (only) has hurt. It's not red, and I don't think anything has been in it, and there's no little stys or anything on the lid. The eyeball itself was kind of sore yesterday, and now it's moreso below my eye, it feels like it's the bone or behind it, and up around the inner side. It's starting to worry me a little, not to mention it's rather annoying...

Any ideas on what it could be? =\