"Depressed is happy for deep people".

Unfortunately I can no longer bare feeling depressed AT ALL. I used to get the exact feeling that you are describing: I could be depressed yet enjoy the opportunity to think things through and have a deeper view of the universe, life and all things I'd normally just view through the eyes of somebody much happier than myself. It was a kind of "happy depression" that I was able to feel.

Don't have it anymore though ):
RB ♥