According to Osho, your fear arises because you are approaching the Master—and thus the ‘death’ of your ego. Near real transformation, the mind trembles; only the unconscious feel nothing. Fear is a good sign: it means something is coming alive. Trust, move closer, and allow the push beyond the cliff of the self; even laugh as it happens.
You’re scared because the old ‘you’ feels it’s ending; that’s good—trust it and keep going.