A 72 yr. old male lost 10kgs since last 3 months. He had profuse guilt for the mistakes he has done in life and doesn't sleep more than 4 hrs. per day. The probable diagnosis is
Dysthymia is chronic mild depression in which person have symptoms for more than 2 yrs. Ref: Essentials of postgraduate psychiatry By JN Vyas 1st ed Pg 604-607
Schizophrenia
Dysthymia
Involutional melancholia
Anhedonia
Mood disorders