You may be interested in reading the book "Undercurrents: A Life Beneath the Surface," by Martha Manning. It is a memoir by a very successful clinical psychologist and professor who succumbs to severe depression to the point of complete disability. After trying about every medication she finally tries electro-therapy and is treated very successfully. It is not a difficult read, nor depressing, but very human, and funny at times. It is a good book in any case, and interesting to hear her journey to accept that this was her only chance to live again. It also comes from an interesting angle because she herself had been treating people with depression prior to and while dealing with her own depression. You can often find excerpts from this book in anthologies of writings on depression.