Hi JustAFriend - I think they are equally frustrating. In my case I think I know that my depression stems from the fact that I had an emotionally (sometimes physically when disciplining us) abusive father, a mentally ill mother and was the target of bullies in school. Like termites eating away at a structure, I had thousands of negative experiences that left me a prime candidate for this awful chronic depression. There was no single event, it was the accumulation of so many negative experiences that did the psychological damage. So I believe I know the source of my depression. Thing is, I haven't a clue how to undo the damage, which frustrates me to no end...