It is a recurring experience I have on pretty much all tryptamines. It's always part of a near-breakthrough experience, but on LSD it's often present even in the most distant afterglow of a trip... I'm sure others have had similar experiences, as it would seem a lot of psychedelic-influenced media suggests it... Like the Doctor Strange movie...
It's hard to describe, but I'll try. It's an inherently synesthetic experience. The hard edges of realities or spaces grinding together, constantly honed into infinitesimal blades. Hairline fractures of reality, permeating everything, especially my own body and spirit. A feeling bordering on pain and sound, like being cut up by the planes of existence, fractured into a smashed mirror.
Please add any relatable experiences you might have had. It would be nice to describe it more completely.
Do you believe in the THIRD SUMMER OF LOVE?