I am mostly depressed but when I get mixed ... I am happy and then racing thoughts of depression, guilt, worthless, useless, suicidal ... a lot like mokie described ... then a sudden feeling of deep sorrow like just finding out someone close passed away and tears start flowing down my cheeks. Then within 10 minutes back to happy. It is awful and scary at the same time. It is like being lost in a world that you know is not real.