The OED notes that 'schizophrenia' may have acquired a figurative use or a transferred use -- the abbreviation is 'transf. and fig.' They give 5 citations
The first is
T. S. Eliot, "The use of poetry", p. 99
"For a poet to be also a philosopher
he would have to be virtually
two men; I cannot think of
any example of this thorough SCHIZOPHRENIA,
nor can I see anything to be gained by it."