If we're going to define history as identical with our perceptions, then arguably we each inhabit our own universe. None of us has the same set of experiences, none of us remembers things the same way. We all perceive things differently and we all have different dreams. Some hallucinate - from drug use, mental illness, or a variety of other causes.
The timeline between our respective ears is personal, and if it changes from one day to the next, how would we even know? Can you remember something one way, but also remember remembering it differently on another day? I know *I* don't.
Journeys in "inner space" are relevant, and can certainly be discussed, but I am skeptical that any sort of universal truths can be found there.
Personal truths, sure. But not universal.