Survivor's guilt

Survivor's guilt was the mental condition that resulted from the appraisal that a person has done wrong by surviving traumatic events, such as combat or disasters. The effect of survivor's guilt depends on the individual person’s own psychological make-up.

Apparent sufferers include Bernice Summerfield (NA: Love and War) and the Doctor's ninth incarnation. (DW: Dalek) interestingly enough, the Doctor's eighth incarnation insisted that he was psychologically incapable of experiencing such a thing after Marnal insisted he had it due to the Time Lords being wiped out during the Second War in Heaven. (EDA: The Gallifrey Chronicles)