This TED talk features great information about "what it feels like to be depressed" presented by Andrew Soloman.
"The opposite of depression is not happiness, but vitality, and it was vitality that seemed to seep away from me in that moment." In a talk equal parts eloquent and devastating, writer Andrew Solomon takes you to the darkest corners of his mind during the years he battled depression. That led him to an eye-opening journey across the world to interview others with depression — only to discover that, to his surprise, the more he talked, the more people wanted to tell their own stories. (Filmed at TEDxMet.)