Eye pain? Eye infection, or something else?

[hebrew it]

Last week, one of my eyes began to itch and water. I left it alone, thinking it could be an eye infection and that I would go in to the doctor if it got worse. The itching and watering lasted for about two days, and then stopped. My eye never turned red and bloodshot, and my symptoms weren't very bad.
About two or three days later, my eye started to hurt. It hurts behind my eyeball, towards the bridge of my nose, but I am having no sinus symptoms. I woke up with a headache because of the pain. When I close my eyelid it hurts, and when my eye rolls up as I'm falling asleep it hurts even more. Looking around with my eyes closed hurts more than with them open, but there is still some soreness with them open, too.
I can't figure out what this could be. Could it be an eye infection, even though I don't have eye redness, discharge, change in vision, crusting, or itching? It almost feels like something is wrong with the muscle of my eye. Could it be a scratch? I do wear contacts
Could there be something stuck behind my eye? I didn't think that could happen, but that's kind of what it feels like, too. I rub my eyes to scratch them, not very hard, and for some reason the affected eye feels a bit numb, like I can't feel the rub on my eyeball as well as I used to be able to, or as well as I can on the other eye, although I can still feel it on my eyelids.
Could my eye just be bruised, or the muscle strained somehow?
It also seems like the affected eye isn't watering as easily as usual. It's not exactly dry, though. And it feels swollen inside/behind my eye...
Please help! I'm worried!