Test Anxiety!!!!

It's a little late but... there is software you can buy. It will tell you if you're ready for the GRE. Google?

Heather,

Just like Pippen said, relax, take care of yourself (and maybe save the drinking for after the test). 

I see from your profile that you are pursuing clinical psychology, so let me preface my comments with a little background.  I took the GRE (and the psychology subtest) about ten years ago.  I got into graduate school, got an internship, got my doctorate in clinical psychology, got a good job, got licensed, and here I sit. I have served on admissions committees for my graduate program, and now make decisions every year about who we take for internship. So I know a few things about the process.

It sounds like you have attached a whole lot of significance to this test, which is only natural, but maybe step back and try to see the big picture a little more.  GRE scores are only one factor that grad schools look at when picking candidates. Who you are as a person, your interests, your background, your personal skills when they interview you, are usually much more important factors. Also, try not to get into the trap of thinking that if you don't get into a certain grad school you won't get the good internship, and if you don't get the good internship you won't get a job, etc.  The culture of grad school will certainly lead you to believe this, but the reality is that some people from "good schools" get crappy internships, and some people from not so good schools get some great internships, and a particular internship may or may not help you get a good job.

All this to say that you have worked hard and prepared, and now just be sure to get some rest and relaxation, and go in there with confidence and nail that sucker.

Best of luck,

Rob