According to Osho, the emptiness, uncertainty, and vulnerability you feel after meditation arise because meditation melts imitation-driven desires and the urge to be special. As the ego's labels loosen, you meet your 'nobodiness' - spacious, boundaryless presence. Though first felt as lack or shakiness, this is the right direction: let go, stop swimming upstream, rest in the present, and discover effortless joy and wholeness.
Meditation makes the pretend “somebody” fade, so you feel empty at first—but that emptiness is open space where real peace can grow.