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Is it like a sharp pain, or is it more like something like an eyelash that's stuck, yet you can't get it out/? You may have scratched your cornea or had similar damage done to the eyeball. It may go away in its own time (I had a similar eye experience, and it seemed to heal itself), but if it doesn't go away soon you may want to contact a professional to get it check out.

you may have scrathced your eye