You found someone before and you will again. There are a lot of people out there, millions of whom you will be able to make you happy.
I'm sorry to say your feeings wont disappear over night, you gonna feel low for a while but you'll get over it. If you go looking for someone, it will be just a rebound thing, do it if you want, but its not gonna make you feel any different. You're just gonna have to stick it out.
Personally I would forget about girls for a while, and just go out with my mates as much a possible, have some fun, go to the movies, go bowling, play some Halo, whatever I felt like.