Oh yeah... that's the stuff.
It seems from your description that you were a hair's breadth away from an OOBE. If you could have resisted the urge to open your eyes or move, deepened into a sleep paralysis or simply raised your vibration enough... you could have tried for an exit technique.
The "or" in that sentence is crucial because it is not just through total relaxation that such impressive altered states as astral projection are achieved. The extreme opposite state is equally as effective. Osho (Rajneesh) recommended a series of very active meditations (more like primal scream yogas) for his followers in the West. He recognized that over here, the path to glory is often easier if it is external and energetic rather than internal and quiescent. Google "Osho Dynamic Meditation" if you are interested, because it involves the kind of emotional release you describe in your post.
Truthfully, the most profound spiritual occurrences seem to come when people stop being polite with the Universe. Rock bottom, wit's end, completely fed up, end of their rope... these are the descriptions of people who are about to break open. I find that the Universe responds when you are 120% intent or 120% empty. Nothing in-between will cut the mustard. The ideal seeker is one who has hit both extremes and synthesized them into that impossible mix of alpha & omega, keen interest & detachment, total investment & absolute dissociation.
Nevertheless, religious texts are filled with people who got their divine encounter when they broke down and began yelling & screaming at G*d. Even the current crop of new-age gurus all fall into this mold. Eckhart Tolle (Power of Now) & Neal Donald Walsch (Conversations With G*d) both describe their "fed up, can't take anymore" moments where they demanded the truth or whatever. Even JC went out into the desert and sat in a circle for 40 days saying he wouldn't leave until he got his answers... of course, this is also when he was tempted by the devil. And, as most people know, Buddha didn't reach enlightenment until he sat under the Bodhi Tree with the hardcore intention that he wouldn't move until he got it.
It seems the Omniverse likes some ballsy intensity. If it is authentic anyway.
I would keep at it Tek. Rage against the machine. Next time, instead of letting up... double down.
All the best friend. Love & light to you.
HF