Shell shock
From Tardis Wiki, the free Doctor Who reference
Shell shock was a military term used to categorise a range of behaviours resulting from the stress of battle. Tommy Brockless suffered from shell shock due to the trauma he experienced while fighting in World War I. (TV: To the Last Man)
Reggie Mead was suffering from shell shock when Amelia Doory first met him in 1915. (AUDIO: Project: Twilight)