Hello and welcome,
I'm sure you'll find many here who will relate to you. I gave up drinking on December 8th--a rather ironic to to stop getting bombed personally (when one considers it was Dec. 8th in Japan when they bombed Pearl Harbor). Like you I had all the same thoughts about "what will I do?", "how can I get through the day?", etc... Well, I've found most of those problems have been baseless and that the fear of those problems was the biggest obstacle.
When you quit drinking (and I do think it's a question of when, not if), you will feel like you're saying goodbye to a friend. Give it some time, don't be too hard on yourself, and you will hopefully come to see you're saying hello to a whole new life.
Keep posting and get strength here. You can quit, you can improve your life, and you can be happy.
Take care of yourself.