In my Heridon Copper stories, one of the main protagonists of the group, John Grouse, suffers from severe depression. He's taking anti-depression meds, but doesn't think it's working. As the story goes on, it gets worse and worse until he decides he just can't take it anymore. My question is: How do I accurately protray someone with chronic depression that he/she just can't seem to get out of? Is there a length of time? Could depression increase? Could he be depressed because of a horrific tragedy in his childhood (that happened decades ago from the time the story starts)? Or does the tragedy have had to occur recently?