I have the detached feeling too, which also causes me to have anxiety. I don't know where the feeling has come from, how long it will last or if I am going to have a seizure or pass out with it. Some days it will go away after minutes, other times it consumes part or most of my day. I have been dealing with an immense amount of pain over the past several months and on days when the pain is at its worst, I often get the detached feeling too.