A depression has settled upon me and lodged itself deep inside my brain. Nothing special going on to cause it, so it's almost certainly just chemical. It's funny how quickly I can lose the ability to care about anything. It's really like a switch has been pulled. At least I've been through this enough times to know I'll come back out the other end at some point.
Oddly, it's only at times like this that I ever feel I could be a Buddhist. My attachments to the world are refreshingly minimal at the moment and my suddenly emptied brain seems primed for meditation.
I'm sure there's a well-established link between depression and religious conversions.