I think I have a similar problem to yours Vortex, though I don't call it depression. In fact I don't think I call it anything. I do think of the possibilities of some things, and deduce the worst and best that could happen, but I guess I'm not optimistic or pessimistic, I just remain neutral and wait for it to really happen. Also, I too, can laugh or cry and such, but then sometimes I'll feel empty. Nothing. Like all sense of emotion I have is gone. Then after some time it comes back again when something happens that lead me to feel something. But the emptiness is still there, still lingering. Just that I feel it the most when I realize I have it and when emotions start to go away. I wouldn't call it a mental illness though. Or is it?