It used to be called Manic-Depressive Illness.

A mood disorder characterized by manic highs and depressive lows

Hi, Yes some Narcissistic people can be prone to similar behavious that is expressed in a manic depressive person. Also some manic depressive, during the early stages of the illness can be diagnosed as Narcisstic.

Manic depressive disorder, also known as bipolar, is a disorder where the individual alternates between states of manic behavior and being depressed.

Bipolar I disorder is characterized by manic episodes, the "high" of the manic-depressive cycle.