Yep, I'm freaking out too!
I have 6 pages of interview questions that I've been compiling for about a year now (started it last year to help friends who interviewed last cycle...I'm not quite that crazy). I've been looking over those, writing a lot of the answers in my blog (ha) and keeping track of the questions I don't have a good answer for yet. A couple of friends and I got together for dinner last night and interviewed each other, and we're doing it again tomorrow. That really helps because you can think of things from different perspectives when you hear other people's answers, and you can get immediate feedback from people that have a general idea of what you're talking about.
I'm focusing on practice questions until Friday, and Friday after classes I will, of course, nap, but then I'll look over my VMCAS, personal statement, Ohio State Supplemental, UF Supplemental, refresh on current issues, etc.
From what I've heard, I'm not relying too heavily on current issues and stuff like that. Everything I've been told is that the interview is 100% behavioral and is just full of "Tell me about a time when..." and "What would you do if..." questions.
My main focus right now is to remember that the interviewers haven't read my file, and I have 50 minutes to sell myself. Even though I might have good anecdotes for the questions, I have to make sure I pick the right ones to highlight what I want the interviewers to get out of my answers.