Survivor's guilt

Survivor's guilt was the psychological condition resulting in the feeling that a person had done wrong by surviving traumatic events, such as combat or disaster. The effect of survivor's guilt depended on the individual person's own psychology.

Apparent sufferers included Bernice Summerfield (PROSE: Love and War) and the Ninth, (TV: Dalek) Tenth (TV: Gridlock), Eleventh (TV: The Time of the Doctor) and Twelfth Doctors (TV: Before the Flood)

Ironically, the Eighth Doctor had insisted he was psychologically incapable of such a thing after Marnal insisted he had survivor's guilt due to the Time Lords being wiped out during the War. (PROSE: The Gallifrey Chronicles)

The Doctor himself began to move on from his feelings of guilt as he kept regenerating, but the psychological scarring of what he remembered doing to end the Last Great Time War still dwelt within him. (TV: School Reunion, Doomsday, Gridlock, The Sound of Drums, The Doctor's Daughter, The Beast Below, The Hungry Earth, The Doctor's Wife, Death of the Doctor)