I have always pictured mine as a black ball that sits in the pit of my stomach, down near the left corner (yes, I get very specific when describing this, LOL, but I've had it since I was a teen, and now I'm certifiably middle-aged, so I've had a long time to think about it!).

When I start to get depressed, I picture the black ball as having exploded, and it slowly starts to make its way up to my throat, trying to choke me. My therapist knows exactly what I mean when I tell him I'm "choking on black goo."

If any of you are Star Trek: Next Generation fans, remember the last episode of the first season, where Yar got eaten by the black goo? Mine isn't sentient :-), but that's how I picture it.

Candy