I don't know if it's exactly the same, but I always remember reading a news article from years and years ago about a specialist facility (in Falkirk, IIRC) where they treated two patients by amputating a leg from each of them. The legs (and the rest of the patients) were perfectly (physically) healthy, but they were so utterly convinced that their healthy legs were diseased/going to kill them/hated them that they were borderline suicidal.
Then again, I suppose it's not necessarily uncommon for people to be obsessively upset by the presence of perfectly normal, healthy body parts in other circumstances.
I also remember them talking on Jeremy Vine's radio show a couple of years ago about 'frequent flyers' who called 999 a lot. I calculated that the person who held the 'record' must have literally called 999 for an ambulance once every three hours of their waking life.
They were legally required to send one each time, so each of those 3-hour periods presumably included the dispatch, trip to hospital, examination and trip back home. Their life must have basically consisted of getting back home from hospital without needing any treatment and then immediately reaching for the phone to start the whole process off again - five or six times every single day.
It's a monumental abuse of resources and phenomenal waste of money, but I simply cannot imagine how terrifying it must be to be that person and to be trapped inside their mind 24/7. I'm astonished they were able (left) to live independently, really.