My depression was set off by a life-changing event. I can't shake this underlying negativity every second of every day. Even when I am happy, I am not and the feeling doesn't last. When I have bad stages, it gets to the point where I feel like my insides weigh a ton, my head is full of cotton wool, and that I cant move my muscles. However I sometimes have massive highs where I do irresponsible things and feel completely euphoric. When these end I have massive lows for months. A friend asked if I had considered the possibility that I have a bipolar disorder or manic depression. Is this the case or is this simply chronic depression?