Hi JoeT,
Yes I do go in and out of worlds. I had my concussion two years ago, and an encouraging sign for me is that my good days have recently become great. Just about normal, maybe a slight headache-but I'll take that anyday over that feeling of being in a different world. For me I would describe it as being at the bottom of a fish tank looking out. It can be a very lonely feeling and even though I feel lonely I usually do not want to be near other people.
Concussedlawyer