I experienced what wikipedia calls 'ego death'. That is I felt my 'self' splitting into the individual sub-components that formed consciousness. Acid is well-known for causing synaesthesia and as I fell deeper into meditation I felt like I could actually see the way sensory experiences interacted with cognitive heuristics and rose to the level of conscious perception.

I've recently come into a deep spiritual terror after such an experience I had while sober (albeit in a slightly manic state from sleep deprivation and some caffeine). Afterward, I refused to speak to prevent any unnecessary harm to whoever I'd seek advice from. This is the first time I've seen anybody describe the experience like this, and I was wondering if you knew any resources or persons of experience.