Sadness is not depression. It feels different to me.

When I was bad into the depression, I still had days when I was sad, and days when I was not sad. Even the days when I was not sad, I still suffered the same. I had nothing to blame my depression on. My life was, and is, amazing. No changes in my life caused this to happen--it just happened.

It makes no sense (especially as I try to explain it)....but I agree with what's been said.

Pay attention to yourself (and ask those close to you pay attention also). Depression makes you unable to help yourself most of the time...

Keep posting.