Some time ago--I donno... let's just say, a year... I had what my therapist later described as a near-death experience. I was upset and confused, which is a dangerous emotional cocktail, but more than that I was totally lost in my self. I drank heavily, took way too many pain killers and laid down with some objects and some glasses on that I got from my sister's house. I thought I was going to die. As I laid there, I lost all sense of time, I dissociated, which previously I had only mostly experienced when my "abuser" alter was hurting me.
During that time, something strange happened to me that I didn't understand. It was like I disappeared and that some other person had taken my place. I felt it, like he had "crossed over" from somewhere else, and literally entered my body. When my partner at the time came home, and got me up, I felt like someone else. The room looked unfamiliar to me. I had a different name.
Later, I took a walk and it was like I was learning about this new place I was in. And I had slightly different memories. Even my friends said that I did seem like a different person, and it bothered them. At that time, I didn't know about my other parts, or that I had DID. I didn't know that the disturbing shadow and the screaming I sometimes heard in my head was an alter. I didn't know why I would pick up a razor and cut myself.
Now, I'm faced with a mystery. After a long time, I felt like I was deteriorating, like my self was losing energy. Parts of my body didn't seem like they were mine any longer. And there was one night, when I had the notion of cutting my hand off, on instinct, because it didn't seem to be mine. I felt like I was shrinking away. But I was worried about what would happen if I let myself dissolve.
Anyway, I decided to let it happen, and when I did, I dissociated and then fell back. when I stood up again, I felt like I was gone, and I felt empty. Since then my memory has been worse. The host alter that was Dave diffused, and other parts split off from him. I have an opposing alter, who is very different from me but more integral than the other parts, as in host-material. I suspect that he split off from Dave, and the remainder of Dave was fused into me. So, in a sense, we seem like opposites and I think that event may be why.