Agreed. I don't think if you really cared about or loved someone that you ever really get over it. If it was real you don't get to stop caring just because you can't make it work out. But at the same time, as miserable as it is, you have to move on. Easier said than done, and not something I'm especially good at. The best advice I've heard is bascally that you have to wait it out. Go on a few dates, but don't put any pressure on yourself. It's dinner, not a marriage proposal. Ask people you don't see regularly so if they say no or it doesn't go so well you don't have to awkwardly avoid them at the office for two weeks. Maybe don't make it a romantic situation, tell your date there's no pressure, you just want to have a nice evening and thought they might like to enjoy it with you. Then at worst you've got a friend and you had a good time. Or even ask someone you aren't especially interested in, like a practice date. You might get a little confidence and you won't feel pressured.
Now sooner or later I may get up the courage to take my own advice.