Post-Traumatic Stress Disorder - Tolkien and his Characters

[Pitchwife]

I'd agree with Bêthberry that Celebrían's an obvious example - she passed into the West in the year after her traumatic experience, so obviously she couldn't bear to live with it any longer.
Another character who came to my mind in this context is Gwindor of Nargothrond from the Silmarillion. His life-story is one of the most poignant in the whole Legendarium. First he has to watch his brother being maimed and hacked to pieces by the Orcs at the beginning of the Nirnaeth. Then, when he allows himself to be provoked into leading a premature charge by this atrocious act, he is captured alive and dragged to Angband to endure sixteen years of slavery as Morgoth's thrall - an experience from which he never recovered.
When Beleg found him after his escape, he was but a bent and fearful shadow of his former shape and mood, and his own people in Nargothrond didn't recognize him, because he looked like one of the aged among mortal Men (sorry, no literal quote - I'm re-translating from my German version of the Silm). What does it take to make an immortal Elf look like that? I'm certain the damage done to him was more than merely skin-deep. Actually, now I think about him a little closer, I picture him like the Middle-Earth equivalent of a survivor from Auschwitz, and I'm pretty sure he awoke screaming from nightmares of Angband every other night during the rest of his life.
And as if all that was not enough, he had to watch Túrin ruining his home, his love and whatever else remained of his former life that was precious to him. Death in the Battle of Tumhalad must have come as a relief to him.
Poor guy. I hope he found healing in the Halls of Mandos.