Check out this article. http://www.wombtwin.com/wtsarticles-borderline/4580514969
Although it focuses on Borderline Personaliity Disorder, many of the statements that "womb twin survivors" tend to identify with overlap with depersonalization and dissociation. For example;
All my life I have been pretending to be someone else, and I know it's not my authentic self.
I have a strange irrational feeling that I don't exist, that "I'm not really here".
I have been searching for something all my life but I don't know what it is.
All my life I have felt empty inside.
I feel different from other people.
Deep down I feel alone, even among friends.
I think a lot about death and dying.
I have suffered for a long time from feeling vaguely unwell, as if I am slowly dying.
There are two very different sides to my character.
I have strong, inner imaginary life that I use as a coping mechanism.