The Collaborative International Dictionary
Demonomania
Demonomania \De*mon`o*ma"ni*a\, n. [Demon + mania.] A form of madness in which the patient conceives himself possessed of devils.
Wiktionary
demonomania
n. 1 An unnatural fear of (l/en: devils) and (l/en: Hell). 2 A delusion that one is (l/en: possessed) by devils.