I know how u feel *hugs*, my boyfriend split up with me just over a week ago. Its tough. But just remember, its a great time to take advantage of the fact that you can eat whateva ( especially the most fattening, chocolatey things !! ), drink as much as you want, and do what on earth you like just because its time to feel a little bit sorry for yourself!! Dont get into a habit of this..... lying under the duvet with Kleenex wont find you a nice new Orlando look-a-like for instance will it? But take a little selfish time to give yourself some sympathy. It'll get a lot of the 'down' feeling out of your system. Try not to think about him too much, which i know is very very hard! But every time u do, go and busy yourself with something else!! Anything! Cook, clean, go shopping, whatever keeps you busy. Then, after this stage has passed, which as frustrating as it sounds, only time will heal, then u can begin to enjoy the excitment of single life again! Remember tht initial amazing feeling you had when u first were gettin together with your boyfriend? You can begin to feel that spark all over again with new people. And take time to getting to know new people.
I know that at first it feels like the worst thing in the world! Im feeling it too. But time will heal. Focus yourself on your friends/family/the though of a new crush etc. It will get much easier. And hopefully you and your ex will be friends one day!