I am definitely in the same boat. Last semester I took 19 credits, the GRE, and the English Lit subject test, in addition to applying to all my schools and working part time. I was hoping that I'd have a chance to recoup over Christmas break, but I spent it working on grad apps and working, so it wasn't very relaxing. THIS semester I've got 20 credits (most of which are in upper level classes) plus work, and I have NO motivation. I've been running myself hard for the past few years, and now I just want to be DONE. I have plenty of work with which to distract myself, but have absolutely NO interest in it.
If anyone has a cure....