...what would it be?
Some suggestions:
Cotard delusion is a rare neuropsychiatric disorder in which a person holds a delusional belief that he or she is dead, does not exist, is putrefying or has lost his/her blood or internal organs. Rarely, it can include delusions of immortality.
Cyclothymia
Folie à deux (translated, "a madness shared by two")
Stockholm syndrome : a psychological response sometimes seen in abducted hostages, in which the hostage shows signs of loyalty to the hostage-taker, regardless of the danger or risk in which they have been placed
Pica is a medical disorder characterized by an appetite for substances largely non-nutritive (e.g., clay, coal, soil, feces, chalk, paper, soap, mucus, ash, gum etc.)
Fregoli delusion or Fregoli syndrome is a rare disorder in which a person holds a delusional belief that different people are in fact a single person who changes appearance or is in disguise.
Huntington's disease :the pattern of repetitive abnormal movements called chorea. Until the 19th century Huntington's disease was grouped with numerous movement disorders, and as with many of these disorders, people with the condition may have been persecuted as witches or thought to be possessed by spirits, and shunned, exiled or worse by society.
The phantom eye syndrome is a phantom pain in the eye and visual hallucinations, after the removal of an eye (enucleation, evisceration).
Rett syndrome a neurodevelopmental disorder that is classified as a pervasive developmental disorder by the DSM-IV. It The clinical features include a deceleration of the rate of head growth (including microcephaly in some) and small hands and feet. Symptoms of the disorder include cognitive impairment and problems with socialization, the latter during the regression period.
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