Feeling of the vibrational stage?

Hi everybody :)

First of all:
Thank you all here for sharing your thoughts and methods. It really helped me a lot, and especially they made me more "secure" on astral travelling :)

After reading, watching and trying for several weeks, yesterday i tried the "Mind awake, body asleep" method.
This was the first time i got into the "vibration stage"... I guess ;)
I don't know what really happened, but i tried this method, thinking of the sentence over and over again, and suddenly my heart beat went extremely up, and i felt something like when you move out of a hardcore roller coaster... like my astral body swapping and turns at random, with a pulsating feeling. hard to describe... so i wonder, because they weren't not really vibrations... more like "shifting" around...
of course due it was the first time, the "woooh yeah, its happening... no wait... calm down" thinking was there and the feeling faded away. but it was there for at least one or two minutes or so. it really freaked me out, because i can remember that i got these feelings when i was a child very often when i went to bed.

so my question: is this the vibration state or just something else?

Thank you,
and all the best, Georg