Patient has blank expressions, sometimes deaf to spouses and children. Has no taste for work of any kind except feverishly looking through records at Libraries and Archives. Has a compulsion to write letters, swears at the postman when he doesn't deliver any mail. Frequents strange places such as cemeteries, ruins, remote country areas. Makes night calls, hides the phone bill from spouse, mumbles to oneself, often a strange far away look in the eye.
Medication is useless.
The unusual nature of the disease - is the sicker the patient gets the more they enjoy it.