Did you possibly mean monomania?
Definitions
Wiktionary
- n. A form of hypochondria involving a morbid belief that one is suffering from an unusual disease
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Lists
These user-created lists contain the word ‘nosomania’.
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-mania
mental disorder; excessive craving
kleptomania, bibliomania, manic, Beatlemania, pyromania, megalomania, ablutomania, aboulomania, agromania, andromania, anglomania, anthomania and 122 more...
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phrontistery - n
from phrontistery.info
nymphology, nympholepsy, nyctophobia, nymphean, nyctograph, nyctanthous, nyctalopia, nychthemeral, nutricial, nutrice, nutrication, nychthemeron and 340 more...
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whichbe Delusion of suffering from a disease. (The Phrontistery) May 16, 2008