I second chickiegirl's advice...Also, remember that there are some times in life that circumstances are out of our control- all you can do is try to pick the best possible option (i.e. fast food may not be ideal, but subway is a much better option than pizza!), and don't put too much pressure on yourself this week. Then, when you're all settled, just get right back on track.
This is also probably not the time to try to kick a caffeine habit...haha...I tried to do that during my first week back at law school after xmas and it was BRUTAL.
You can do it!
Good luck with your move!