Herein lies the challenge of psychedelics, in terms of the fear that naturally arises as the ego dissolves. Generally speaking, the sense of being an individual self tends to return in a matter of minutes, or hours, like a boomerang that comes back around. However, the liminal space, in between, can be unnerving, in my experience. I suppose that surrender, in this case, entails the acceptance of the individual/authentic self being offline, for a little while, and trusting that it will return, as it tends to do.