MSFinals-5598

A 42-year-old man visits his doctor’s office and reports that his partner of many years passed away recently. He shares that when he woke up this morning, he believed he was lying next to her and heard her voice calling his name. Despite knowing that this is impossible, it has caused him considerable anguish. He is concerned that he may be losing his mind. He has no other significant psychiatric history.
What is the probable diagnosis?