What is motivation, and where can I download some?

I am sitting here, staring at my computer, knowing what I need to do before tomorrow, and unable to summon any motivation to do it.  At all.

And I am sad, oppressed by a meaningless sadness that has no actual cause other than some stupid chemicals produced by my body going out of whack for a couple of days.

I freaking hate hormones.

Especially because I know that what I am feeling is a lie, and yet I still cannot summon up happiness or motivation.  I am still slouching here, my face slack and my eyes sad.

10 days.