I've had depression and GAD since I was young. Usually my apathy would be sort of "fixed" by high anxiety. I'd procrastinate, get anxious, and then do what I was supposed to do.

I still struggle with anxiety, but no longer in this pattern. I can't bring myself to care about important things like work. I know logically that I should. I can name reasons why. 

But I just... don't... care. At all. I feel empty. Eh.