when i sobered up i went through a depersonalization / derealization phase for months? in and out of it. it was scary at first but then I figured it was my brains way of protecting me from the sobering scary shock of reality and that it was ok. In time it got better. I acutally miss the depersonalization / derealization stuff and sometimes will slip back into it here and there.
For me it felt like i was watching my life take palce as a play as if i was sitting on the outside looking in. it was a lot less scary from that perspective.