Booze is not the answer. (Good advice here from many people who care as much as can be possible on a internet fourm, so take heed man, and STOP DRINKING!)
I don't know your life, but I can say that love gone wrong sucks, and it seems like there is nothing left for you, but that's bullshit.
Life goes on, and you will get over her, and move on.
When I was 23, I was in deep with a Dutch girl, so much so that I chased her all over the world, and finally in Holland, it was finally over. (After 7 times of getting engaged, and having her break it off, you would think I should get the hint eh?)
Funny part is she comes back to me a few months later in Idaho, and want's to get back together... Very tempting, but I had a new girl by then, and had moved on, so I said NO. It was very liberating, and completely not what I'd have thought possible just a few months sooner, but when they trample your heart, and you finally learn that it's time to move on, going back is not an option.
So now I'm nearly 40, have two great kids, and a wife that's a great woman to have around.
You know what's funny? This Dutch gal has tracked me down 3 times over the past 17 years and wants to get back together! She's psycho for sure, and I think the letter from my wife telling her to go away finally might have worked.. LOL
My point is, get sober, get cleaned up and get back out there as painfull as it is, you have to move on, and it will get better the sooner you get moving.