I feel so bad for you ILS, I know what its like to have your heart broken like this, and believe me, I feel for you.
It's not going to be easy right now to imagine going through life without her by your side, even if its only temporary. Here is what I suggest you do, because this always helped me get through my problems:
Attach yourself to your friends very strongly, hang out with people that will listen, talk to them about the problem and be sure to tell more than one person how it makes you feel inside. Talk to people you trust, and get advise and opinions from as many people as you can. This helps you first get your emotions out, which belive me, is alot better than holding them inside. It also helps you learn and grow as a person, you learn new sides to things and begin to see a little clearer.
Remember that friendships are usually more solid than relationships, no make that ALOT more solid. Surround yourself with friends, because even when relationships go sour you still have friends who love you and care about you as a person, and right now that is what you need. Reach out, talk to them, perhaps go out and do some things with them. Even if you feel sick and depressed, even if you really dont want to do anything but sit in your room and cry, get up, walk out that door, and do something with friends, eventually you will begin to build up that wall that protects your heart, and you'll be independent again.
I know, I just went through a very very rough time with a certain girl. When she left, I surrounded myself with my friends and talked to many people about what happened, it really softened the blow, and in fact I'm extremely proud of myself for having taken her loss so well. But it is only because my my friends and those who love and care about me that I got through what I went through, and therefore I tell you right now, turn to your friends, they are your strength when youve lost everything.
I hope all begins to fall into place over the next week or so. It wont right now, it can't right now. All of us get hurt very badly at times in our lives, but hurt can be a positive thing. It is our pain and heartbreak that makes us stronger people, we learn from mistakes and we learn from pain. In the end it makes us happier people. What this will do is make you a stronger person, it will enable you to handle future breakups a bit better. And yes, you will break up again, with someone else, in the future. You've got your whole life ahead of you and you'll go through several women before you find the right one, and each relationship, from beginning to end, will teach you new things, and these things will help you grow into the person you are meant to be, and ultimately lead you to the one that you'll spend the rest of your life with, it prepares you for the larger picture that lies ahead.
So look at this as a lesson learned, and dont ever regret anything that happened. Out of this youll become stronger, and remember, if you need someone to talk to and give you support, I'm here.
Best of luck to you,