The period of normalcy is seen between two psychotic episodes. The diagnosis is
Bipolar mood disorder earlier known as manic-depressive psychosis is characterised by recurrent episodes of mania and depression in the same patient at different times. These episodes can occur in any sequence. (Ref: a sho textbook of psychiatry, Niraj Ahuja,7th edition, pg no73)
Schizophrenia
Manic depressive psychosis (MDP)
Alcoholism
Depression
Mood disorders