Maybe pick up the phone tomorrow and get on to the SMART people as soon as possible. Then you might be able to start working on taking the edge off some of the cravings and negative thoughts you're having.
The sooner the better!
Just because you'll be sober to celebrate your birthday doesn't mean you won't enjoy it. In fact, you might even enjoy it more because you'll be properly with it, you'll remember it and you won't be a wreck the next day.
Would you prefer to enjoy the celebration and the memories than waking up the next day trying to piece together what happened?
What kind of sober thing do you think you might do?