I wore contact lenses for a second and now IDK why my eye hurts so much?

You've either ripped or scratched your cornea. Well if you dont have time to go to the optemistrist, or ER, then I'd suggest taking pain medicine like Tyenol/Motrin/ETC. Taking a cold rag inserting it on the eye, and half way in the eye , and then lay down. Later that day , you can ask someone to buy you some eye drops for pain relief, it'll probably only last a day :)