The lyrics of Metallica have a lot to do with CPTSD in the end. Dirty Window, Invisible Kid, even Prince Charming or King Nothing. The Day That Never Comes is about PTSD. No wonder I love them. No wonder they speak to me and to so many people.
I got introduced to Metallica by a guy who came from an alcohol family and did not speak English. But he spoke emotions. It has been always shocking to me how well he could understand the lyrics without understanding the language.
Invisible kid
Never see what he did
Got stuck where he hid
Fallen through the grid

Invisible kid
Got a place of his own
Where he’ll never be known
Inward he’s grown

Invisible kid
Locked away in his brain
From the shame and the pain
World down the drain

Invisible kid
Suspicious of your touch
Don’t want no crutch
But it’s all too much, yeah

(...)

I hide inside
I hurt inside
I hide inside, but I’ll show you

I’m ok, just go away
Into distance let me fade
I’m ok, just go away
I’m ok, but please don’t stray too far
He had one emotionally healthy parent. In the end that did wonders for him.