I have experienced a similar shake. I sense when i start to feel this that my chakras are being emphasized in a way that my physical perceives them as quakes in the internal. This happened quite often before my first (what i call my first) official "break through" into beyond. It seeemed to be a lesson to be prepared mentally and spiritually before any experience. Maybe you can find your center within a certain song, or chant before a spice journey.
Much Love & Sincerity,
Perceptual Reality
We are perceptions, we can all change. Everything Perceptual Reality posts is hypothetical or fictional.
Perceptual Reality is an outer-space inhabitant with the capability to send messages through channeled thoughts and consciousness, therefore, earthly laws and regulations do not apply. "It" Is a student studying, learning, and passing these teaching onto other students.
Unconditional love to the great beyond!