Traced back to the Civil War, what was the orginal name of what today is known as PTSD?

1000 BC an Egyptian combat veteran named Hori wrote about the feelings he experienced before going into battle: "You determine to go forward... Shuddering seizes you, the hair on your head stands on end, your soul lies in your hand."

Herodotus wrote of the Spartan commander Leonidas, who at the battle of Thermopylae Pass in 480 BC dismissed his men from joining the combat because he clearly recognized they were psychologically spent from previous battles. "They had no heart for the fight and were unwilling to take their share of the danger."

Herodotus tells of another Spartan named Aristodemus who was so shaken by battle he was nicknamed "The Trembler" - He hung himself in shame.

Herodotus described, during the Battle of Marathon, an Athenian soldier who suffered no injury from war but became permanently blind after witnessing the death of a fellow soldier, yet the blinded soldier was not wounded.

1003 A.D. the Anglo Saxon Chronicle recounts a battle between the English and the Danes in which the English commander Alfred reportedly became so violently ill that he began to vomit and was not able to lead his men.

1859 the French scientist Briquet elucidated an association between childhood histories of trauma and symptoms of "hysteria," such as somatization, intense emotional reactions, dissociation and fugue states.

Jon Eric Erichsen, a British surgeon, in 1867 published a book called "On Railway and Other Injuries of the Nervous System". In it he argued that an unseen physical injury to the spine and brain caused the condition 'railway spine.'

The German neurologist, Herman Oppenheim, first used the term "traumatic neuroses" in 1889. He proposed that functional problems were produced by subtle changes within the central nervous system.

The 1900's saw names such as; Disorderly Action of the Heart, Neurocirculatory Asthenia, Shell Shock, War Neurosis, War Hysteria, Stress Response Syndrome, Combat Stress Reaction, Concentration Camp Syndrome, War Sailor Syndrome, Rape Trauma Syndrome, Battered Woman Syndrome, Vietnam Veterans Syndrome, Abused Child Syndrome and inevitably in 1980, Posttraumatic Stress Disorder (PTSD).

It was called Nostalgia.

Back through the years, here are some of the terms:
Civil War: Nostalgia, Irritable Heart, Da Costa’s Syndrome
WW I: Da Costa's Syndrome, Effort Syndrome, Soldier's Heart, Shell Shock
WW II: Battle Fatigue, Combat Exhaustion, Effort Syndrome

I know it was called Shell Shock in WWI and Battle Fatigue in WWII. It has changed names many times but the basics are the same.