I can see what you mean by that and ive also read it before.
I know the feeling of Dp when having high anxiety or a panic attack but the Dp i get now is usually when im just worried but not overly anxious.
Its constantly with me, to a certain degree anyway unless im totally engrossed in something.
Its a horrible place to be but the other hand i find it quite safe and calming.
My heart wont be racing or any other anxiety symptoms, im just totally detached from the world.
It can make me feel anxious, it depends what situation im in but the Dp comes before the heightened anxiety.
It makes me feel like an alien, and the world looks so strange. Im not very good at explaining what it feels like. Im getting help for it now.