Anyone have experience with low-level chronic depression like dysthymia? Full-on major depressive disorder is something I already knew about, having gone through it once myself. But the other day I was reading an article that described it as "just a vague sadness" that persists for years until it becomes part of the ordinary background noise of your life. You still function normally, you do fairly well, but you're always down. And you tend to start filling that void with...God knows what. Anyone heard of this?