Survivor guilt

Sadness, grief, depression, moodiness Distressing dreams Guilt or survivor guilt ... 

Guilt about things other than actions taken or not taken by the survivor at the time of the death. 

Pervasive among the survivors is a bitterness, a feeling that it was not necessary to bomb a populous area to win the war, he told me. And there is also intractable guilt for many who recall, in the panic of flight, ignoring the cries for help from persons trapped in the rubble, caught under collapsed walls, as fire spread through the shattered city. 

Levi took his own life after surviving the holocaust and after writing several books, the best known of which remains The PeriodicTable. He is believed to have acted out of survivor guilt. 

---