Think about the tools you were taught in rehab. I understand that it's different out there in the real world, and I was scared when I left rehab, too. Keep going to meetings. Get to know people at them. Pick one of those phone numbers and use it, okay?
I suffer from depression and anxiety and I know how hard it can be without booze to numb you out or lift you up, but it really does get better, I promise. Take some sort of positive action tonight, and put another sober day behind you.