Meditation & Buddhist

I'll keep this post from long ago as it will always pertain to me: I was totally into Buddhism/mediation at one time...will relate the results soon. Notes n things.
I was never good at following rules..."20 minutes of mediation"...I usually went at least 2 hours at a sitting..Never using a Koan, not concentrating on anything but letting my thoughts run.
It was my way of attaining a "High". I became somewhat addicted to my meditating and time away from real life.
There came a time,,perhaps going for hours that particular night...I was very deep in the nothingness of letting my thoughts go running.
Then as if someone had hit a giant gong right next to my head! The vibrations were overwhelming! I felt myself, my spirit leaving my body, going forward...but as I was doing this "leaving, separating", I felt a hand, something grab me from behind and pulled me back into myself. Instant back to normal, awakeness ! A clarity, as a voice told me that I would never attain that again. And I didn't. From that sitting on till this day, I can not meditate as before nor have I ever came close to what had happened that night.