Fragmentation
The experience of fragmentation occurs in some stages of spiritual
development. In the deeper stages it loses its threatening and
terrifying character. This is partly due to the increasing insight
that it is an image that is fragmenting, not oneself or one's
body. Also, the individual increasingly attains a capacity to
be the self without the self-representations. So we can experience
the self and the self-representation separately. And since we
can see directly that it is not who or what we are that is fragmenting,
but some representation of who or what we are, there is more equanimity
about the experience. (The Point of Existence, pg 505)

In dealing with narcissistic issues, or with issues on the level
of deep ego structures, one sometimes encounters the experience
of fragmentation. As a result of either an already existing weakness
in the structure of the self, or deep work that has dissolved
ego structures, the individual experiences fragmentation, or disintegration.
The sense of fragmentation often feels literal; the person experiences
his body in fragments. This terrifies him and brings fears of
death… how can we explain the graphic and vivid experience
of one's self in fragments when in actuality one's body remains
in one piece? The usual understanding is that the fragments are
not of the body itself, but of its image in the psyche. However,
the individual’s feeling is that he himself, not an image
in his mind, is fragmenting, and thus, he will likely experience
physical terror. This is because the image of the body forms a
central component in the self-representation. (The Point of Existence,
pg 60)