From the little that I had read recently It's used to stop symptoms (anxiety) from flaring, taking you away from an the actual sensation or memory. The fantasy mode is shifting your mind further into a better place.

I guess your pacing is a combination of pacifying and escapism from anxiety.

I caught myself pacing (body building) and although my pacing is basically to catch my breath and to be ready for the next set...my mind just wouldn't let go of your pacing until I looked into it some.