Sinead O'Connor Cancels Her Tour Sinead O'Connor says she is canceling her 2012 tour because she has bipolar disorder, the latest in a series of erratic pronouncements by the Irish songwriter suggesting she is deeply troubled. Ms. O'Connor, 45, made the announcement on Monday on her Web site, saying her doctors had told her to avoid touring after a "very serious breakdown between December and March," The Associated Press reported. Her Web site was later taken down, though a fan site preserved her comments. Her most recent album, "How About I Be Me (And You Be You)?" (MRI), was released in February and a tour had been planned to promote it. But Ms. O'Connor said in her statement that plan was too optimistic, given her mental state. She said she had been "attempting to be stronger than I actually am." Ms. O'Connor apparently began to unravel in public last summer, when she took to the Internet to advertise for a man, talking in explicit terms about her sexual frustration. On Dec. 8, her 45th birthday, she married one of the people who responded to her messages, an Irish youth drug counselor named Barry Herridge, then 38, at a Little White Wedding Chapel in Las Vegas. They split up two weeks later, then reconciled, then split up again. She detailed her interpersonal drama on Twitter and her blog, complete with pictures. She was scheduled to play shows this spring in Milwaukee, Chicago, Boston, New York and Washington at the newly reopened Howard Theater. In the message, Ms. O'Connor said she still hopes to perform at a tribute to Curtis Mayfield in New York this summer.