Probably got some bad Kim chee. :-)
“To the best of my knowledge, she had symptoms along the lines of a serious flu, and her doctor thought it was best that she would get a check-up at the hospital,” said her spokesman, Elliot Mintz. “There is no stroke and there are no life threatening circumstances as has been described to me.
“It’s just an advanced case of the flu.”
http://abcnews.go.com/Entertainment/yoko-ono-hospitalized-york/story?id=37237215