I don't know if I experience vibrations, but after I sit down and expand my mind for a few minutes, if I don't control my body suddenly my limbs begin to shake and move about on their own. Are these vibrations? I can control them but if I don't they just start moving on their own and it can get pretty INTENSE not just lightly moving but literally shaking. I don't know if these are vibrations because I haven't even gone Out Of Body yet.
These are not the classical vibrations. Vibrations cause no physical movement (usually). The ‘vibrations’ are more like a huge electric current running through every cell of your body, every cell hums with increased intensity as your ears and head roar with what sounds like a vast waterfall. Intensity can vary, but they are unmistakable (and perhaps vary slight from person to person).
It might be worth getting a health check-up as what you mention above and your other thread about depersonalisation might warrant looking into. It’s always best to err on the side of caution.
Years ago I went through a period where the vibrations would cause intense jaw pressure (almost pain) and because this can be an indicator of a heart problem, I had an ECG to check it out - everything turned out fine.
Health should always come first, especially as effects from OBEs could possibly mask real symptoms (buzzes, vibrations etc).