Might not be what you want to hear, but you'll move on. It always hurts when it's fresh, and you may feel like you'll never forget that person or that you've lost the will to go on, but all wounds heal with time.
You might feel like crap but definitely don't waste your time brooding on it. Get out, spend more time with your friends, find something to occupy your time, reinvest some time into studying (if you're in school), it'll help the transition a lot more.
Surprisingly, if you can find a hobby or something that gives you comfort (religion, believe it or not, is a BIG one...I know some people don't buy into that stuff, but honestly it -really- does help, try going out with your church's youth group if you have one), just engage in any activity that holds your interest.
The first night is the worst, but you'll feel a lot better in the morning. The last thing you want to do is sit in front of a computer, go out for a jog. Physical exercise relieves a lot of stress (it's scientifically proven too :P). Tire yourself out so you can fall asleep, you'll be much better in the morning.
There are 6 billion people in the world. Chances are you'll find another. And even if that isn't for a while, a relationship isn't really necessary to live life. In fact, it can take away from some aspects, such as spending time with your friends or engaging in your interests.
Anyways, good luck man and keep your head high. It's not worth wrecking yourself for another person. Enjoy the memories, occupy yourself, and move on.