Possibly, probably definitely, Hashimoto encephalopathy.
Doherty
Colin P
CP
D049672:History, 19th Century; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D013967:Thyroiditis, Autoimmune / Q000175:diagnosis* / Q000266:history / Q000503:physiopathology