Our king don does the same thing. His violent outbursts are based on wanting to attack everyone who ever crossed him and he flies into RAGES when it doesn't happen. HORRIFIC RAGES. HE EXPLODES!
Now that is not normal. The don is definitely mad on both levels. ANGRY and CRAZY.
King George sometimes had to be subdued by putting him in a straitjacket, chaining him to a chair and forcing him to drink a cocktail of medicines. What they found when they analyzed his hair was a very great concentration of arsenic. Not that anyone was trying to kill him but apparently he took an emetic regularly that had something in it containing arsenic. Also the powdered wigs they wore at the time may also have had some arsenic in them.