Hey there Urri, your fantasy story was actually intuitively very astute and observant of you. Blavatsky apparently took her teachings from the Sanskrit Veda and similar such texts, which is what I am using as a reference here.
I remember reading some of Robert Monroe's writings on astral projection, if I remember correctly. He and hos students may have had other experiences directly too. The Veda tell stories of how there is life on other planets and how some are better and some are worse than this one of ours. And we may take birth one any of these planets, and live longer and more powerful lives on some.
Your intensive care experience of an altered state or near death event, sounds very insightful. Indeed, the ancient texts tell us that there is a specific technique of meditation that can facilitate our awakening or liberation of consciousness. It is the science of consciousness, or true metaphysics.
!ALIVE1000