@wayner, whatever you do DON’T THINK ABOUT PURPLE ELEPHANTS!!!
you thought about purple elephants, didn’t you? that is much the same as actively trying to get over someone. instead, i advise that you learn to accept the way you feel about her, maybe even use that pain of unrequitted love to fuel your own interests, and eventually develop passions by which to advance your life.
that’s my MO these days, so hopefully things will continue to fall into place.