Center, my experiances with meditation(focusing on third eye chakra) or, sensory deprivation(I don't have a sensory depravation chamber, but blindfolds and no nasal breathing and earmuffs is a good launch point) while on hallucinogens has brought me to a similar point.
However when you step into the void at least in my experiences there's no knowledge, or time, or any constructs of reality or of self. There just IS. I believe that is the root of life, or as you referred to the origin. We all are one with this matrix of energy or potential energy, however our mind tunes it out to survive in this realm of existance(to eat, sleep, predict, emotional states, etc) because we have to exist in this realm of existence to fulfill the infinite(that is the course of life).
I haven't found a way to channel anything out of it(career path, spiritual ideals, etc) however it does leave me very glowy for a while, and is an excellent tool for stability and clarity.
also... I've had the counter-balance occur after leaving as well. some of my mental ail-ments trigger a lot harder. I've had card-board cutout visuals of indescribable things and harsh cases of HPPD, and some WEIRD dreams(meeting god etc...). The only thing I've found to cope with those things is to do the meditation in nature, or if you don't go out into nature immediatly after(unnatural structures are far to much from a recently purified mind), and not do drugs to get to that state of mind.
and <3