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Hopefully for your sake its all good.
My mate completely tore his ACL skiied on it for years without knowing, in circumstances like yours. It hurt for a couple of days, then he though it was all good with no pain. Didn't realise until he tore his other one this year that he'd lost his ACL years ago. We'll see this season if people can ski without both ACL's. Moral is that it is possible to ski without an ACL without even knowing you don't have one anymore.
Or it sounds like you could have torn something and have something floating in the miniscus of your knee.