This is also known as manic depression or bipolar disorder. It is a disorder characterised by swings in a person's mood from very high (mania) to very low (depression).
A mood disorder that commonly begins with depression and is characterized by at least one period of elation sometime during the course of the illness.
A mood disorder with revolving periods of mania and depression.
excited few weeks depressed few weeks up down up down but have normal life inbetween when good mental health.