Dear Jo,
I am so sorry to hear that you had to experience this. That feeling you described, where you feel like you are in a dream, or lost, I know that feeling well and I'm very afraid of it. It is one of the main reasons I don't leave my house. I'm so sorry you experienced it. I looked up "depersonalization" because I thought that "dream-state" and feeling lost, ect., were only part of my panic attacks. Here is what I found:
"Sufferers of depersonalization feel divorced from both the world and from their own identity and physicality. Often times the person who has experienced depersonalization claims that life "feels like a movie, things seem unreal, or hazy." Also a recognition of self breaks down (hence the name). When a person suffers from the disorder (or the symptoms associated with it) he or she finds that when looking in the mirror, his or her face is not familiar, though logically he or she is completely aware of his or her identity.
The feeling is said to be like being a ghost. No matter how hard the person tries, he/she cannot feel like they are genuinely interacting with the world. They can't seem to perceive themselves as being normal. While the person is struggling to feel everything as normal, there is a part of themself which begs to just give up and stop the struggling. A sufferer from depersonalization can be especially susceptible to suicide, undertaking the suicidal process calmly and easily without real awareness. Simply put, depersonalization is an alteration in the perception or experience of oneself, so that the self is felt to be unreal; the person feels detached from reality and/or their own body or mental processes.
Another possible way to describe the actual physical manifestation of the feeling is to compare the very popular film technique called a Vertigo shot or Dolly Zoom. In this technique, the subject of the picture stays fixed on the shot while all the surrounding background is pulled away - providing a sense of vertigo or detatchment. People may perceive this feeling in a cyclical manner, where the feeling is experienced back-to-back-to-back in rapid or non-rapid succession." (Borrowed from wikipedia.org)
I have suffered from this feeling and it is terrifying. If you'd ever like to talk, let me know a