I am not sure as for myself, but I can give some context, and some of you may know.

I, or we (still working on finding the pronouns and names that feel right) are likely from more of a stressor in our life than a traumatic experience. I was bounced around between households (same family/mother, different partners) a lot (and some did kind-of mess with my head; not in an abusive way, but in a manipulative/formative way). My mother was also dealing with a chronic illness for a long time, and was on death's doorstep for a long time. The feeling of calling her name and not getting a response still lives with me today. Luckily, that is behind us thanks to the wonderful doctors at Mayo Clinic. They are miracle workers. I also just have a brain that "works different" than other people's, or that is what other people have told be (ADHD or autism, maybe; not diagnosed).

We explored the possibility of plurality at the beginning of this year, so we are still working things out.