My first ever post on here was similar to yours. I was all traumatised & desperate & shit & had been googling "how to win your ex back" when I stumbled upon this forum full of lovely cunts. Now I'm even ranked #24
(I should be higher, sort that shit out please Jaz)
I won't go in to my story but I'll say this, ermmm, just do all the things Jaz said.
It took me 3 months of an alcohol haze before I realised I needed to try & move on. I eventually moved away 50 miles away a year later because of other stuff that happened involving the same girl, but the thing is life is fucking awesome now.
You're not the first guy to have his heart broke, & you won't be the last. This experience will actually toughen you up, there is a lesson included in all this.
If you can move away to a new city, that would be my advice. If you can do that, do it, along with everything Jaz has said.