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“phrenophobia”
An irrational aversion of thinking or a dread of losing one's mind: Jack was certain he left his keys in the basket, but didn't find them there, and thought he was going mad or was crazy, and therefore suffering from phrenophobia!
This entry is located in the following units:
phobo-, phob-, -phobia, -phobias, -phobe, -phobiac, -phobist, -phobic, -phobism, -phobous
(page 33)
phreno-, phren-, phreni-, phrenico-, phrenic-, -phrenia, -phrenic, -phrenically
(page 5)