Jay McInerney is recovering from emergency brain surgery. The 69-year-old novelist – whose book ‘Bright Lights, Big City’ was turned into a 1988 Michael J Fox film and who was part of a 1980s literary ‘Brat Pack’ including ‘American Psycho’ writer Bret Easton Ellis – wrote to friends to say he fell over at home and later had to be rushed for emergency treatment. In an email he sent to friends which was obtained by Page Six, Jay said he had a dizzy spell followed by a fall at his home in Manhattan, New York, and woke up the next morning to find “blood all over the bedroom, the bathroom, the hal…