I'm so sorry to hear that you feel like this, break-ups and moving on can be such a hard and draining time.
I don't really know what to say other than at some point it will become a little bit easier and everyday it will become easier until one day you will realise that you've moved on and you don't need to dwell on this anymore.
It took me a VERY long time to get over somebody about a year and a half, I sort of went through the same thing as you although i was still very good friends with this guy and saw him everyday at college and hung around with him which was hard. But eventually i just sort of got over it, i dont even know how, just one day become easy and i didnt feel like that anymore.
Things will get better and easier, it might not be tomorrow, a month, even a year but eventually it will. You've got to remind yourself that so many amazing things in your life havent happened yet and you have those to look forward to. Hope it gets better love x