Needing motivation

I tried to go to sleep early last night -- I was exhausted -- but still managed to lie awake tossing and turning for what seemed like hours, and then the alarm went off way too early. And then I got into work -- where my big project for the week is to clean out and organize old case files from one of the file rooms that they're planning on turning into more office space. Of course, I felt singularly unmotivated all day -- and got next to nothing done.

If I really think about it, it's probably the perfect project for me right now, considering that my head's all consumed with the condo-purchasing slated for the end of the week. Still, I'm not rushing to go dig through all of those boxes. So what I need is some kind of motivation -- something to coax myself into getting through all of the crappy work by the end of the day on Thursday. But I'm out of ideas. I mean, usually my motivation would include some kind of shopping, but I am on a budget. (And I mean it this time!) Clearly I need help. So if anyone can give me pointers on how they convince themselves to get through boring, monotonous, and menial work projects, I'd appreciate it.