Law school is very intense, and one of the hardest things to do is exercise and stay physically and mentally fit. However, it would be pretty easy to keep drinking and gaining weight. If I were you (I'm assuming you are male, not because women can't do physical laobor jobs, but because it's harder to get hired), I would go get a job as a landscaper or some other physically active labor job. In 2 months you will have shed some serious weight and you will be too tired every day to go out drinking. You will be ready for a change from physical labor to law school. It will be a good change from your current bad routine, plus there is something so satisfying, to me anyway, about straightforward labor. You can actually see something getting accomplished. If I could go back I would have bailed on my dead-end job and gotten in shape. You don't need a vacation, you need to do something useful. And you need to loose that weight. Because you are likely to gain more in law school.Sounds like you've had oppurtunity to build some savings. Now get your body in shape and out of this slump.
The only advice I can give you is try not to begin drugs! Many people begin crystal meth or cocaine, for instance, to lose weight!