Thanks to all for the interesting, if at times off-topic, replies. The OED first use information is especially helpful, and confirms my prior suspicions that mental illness is not a product of pulitical kerrectitude, though that may explain a portion of the preference for it.
My user name was taken from something by Julio Cortázar I read in the late 1960s. It’s not in the Diccionario de la RAE, so I’ll have to take your
word for my presumed condition. My Peruvian colleagues confirm your apprehensions.