Another like Syd Barrett was Skip Spence, a fellow acid casualty. Syd had been the Jefferson Airplane's original drummer (on only their debut album, Takes Off) before joining Moby Grape as songwriter/singer/rhythm guitarist.
Skip's Oar solo album may remind you of Syd's couple; a horrific view into drug-induced insanity. Skip was in a state mental hospital until California Governor Ronald Reagan closed them all down, throwing all the patients out onto the street. Great idea ;-) !
Syd could thereafter be seen aimlessly wandering the streets of downtown San Jose, bumming cigarettes. Careful with that ax, Eugene.