I am going to refer to it now as physical depression and mental depression.

And, you haven't countered my theory with scientific evidence. You've only told me that science exists.

And, in some ways I do have science on my side. I just did some searches on Forward Head Posture and Ergonomics and the link to depression/stress/anxiety and there's lots of people studying that and saying it's one of the causes. Maybe I've figured out why. I'm going to send it to people working on those studies and see what they think.