How do you tell the difference between a sprained or a twisted ankle?

In second period today we were doing our choreography for our spring concert monday and its was like this side to side toe touching finger snapping thing we were on and I goto the right and it happens that at just that moment my ankle bends the wrong way and I hear a *pop* I stuck it out the rest of the school day and at play practice because I could walk on it but it like really hurts now and it is swollen to the size of half a baseball and its starting to turn blue. Is it just twisted or sprained or just popped??? I know its not broken because I can move my toes and stuff and I can move it from side to side and up and down with some discomfort but I can move it. And I know people say just to keep off of it but that is like the worst you can do because it will become stiff and hurt worse...I'm worried that when I goto bed and wake up in the morning that I won't be able to walk at all....

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