What illness is causing these bizarre slaughters?

Rowan Dean:

The world of mental health and wellbeing has been rocked to its core by a bizarre global outbreak of inexplicable nervous breakdowns. Researchers are struggling to find a common cause or factor that may link or in some way help explain what is behind this mysterious epidemic of mental, or psychiatric, illnesses. Thus far experts remain baffled as to any similarities between the cases, which to date have been reported with their own specific...