Why would I suddenly become ridiculously attracted to a teacher?

I had this teacher last year who was in her mid twenties. she was not only gorgeously beautiful, but really nice and a good teacher. . Then one day, almost a year after I had her I woke up mivley infatuated with her. Now I can't stop thinking about her. Not matter what I do, seriously she's in my head all the time. I walk by her room just to get a glimpse of her, I get the impression she doesn't like me, even though there's absolutely no proof of that, I get all nervouis and jittery when she's around, I don't want school to end because I can't stand the thought of not seeing her every day, I feel jealous of everyone she talks too, and I feel depressed, mopey, and miserable all the time and I feel she will completely forget me.. Why would this suddenly happen? Even though I barely gave her a thought for almost a whole year. Is there any way to get over this as its causing a lot of heartache. Should I try to talk to someone about it? Oh and my teacher doesn't know and I would NEVER tell her. I don't want to pursue anything, I WANT to get over it.