You say:

"And when the brain stops functioning, we continue just as we were before it stopped, seeing, hearing, tasting, touching, and smelling exactly as we did with a body"

Just how can that be? It seems obvious that the body with its five senses is our channel of information about the physical world, and changes in it changes our perceptions too. Obviously, when the body goes, physical sensations should go too, unless replaced by something else.