DEFINITELY take a break. Go re-read a poker book if you feel that you want to stay involved in the game without continuing to lose money. Maybe go and read about variance so you know it's just not you it happens to. The main thing to remember is that you should not play another hand until you are confident you've got over the bad spell, otherwise you'll be playing on tilt which will take you down even further.

I expect somebody else will come along and re-word this much more nicely and add some other hints to it. But even just one day off the game might be all you need to get away from any tilt.