Neurotic? or Psychotic?

GEORGE SAYS

A man enters the psychiatrist's office. He is dressed in the uniform of an 18th century British admiral: boots, white knee breeches, blue tunic with gold braid, tricorn hat. He has a patch over his right eye and his empty right sleeve is tucked into his jacket.
He says to the psychiatrist: You've got to help me - I keep thinking I am Napoleon.
The psychiatrist says:Nelson - you keep thinking you're Nelson.
The man replies: I AM Nelson - But I keep thinking I'm Napoleon