Sinead O'Connor Cancels Tour Dates After "Serious Breakdown"

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Troubled, erratic singer Sinead O'Connor is pulling the plug on her upcoming tour after a "serious breakdown" caused by what she says is bipolar disorder.

The Irish songstress, who spent much of 2011 worrying fans with profane, sort of suicidal Twitter rants, canceled the 2012 tour dates on doctors' advice.

"With enormous regret I must announce that I have to cancel all touring for the year as am very unwell due to bipolar disorder," she writes on her website.

Sinead O'Connor Tattoo

Right after her days-long marriage to Barry Herridge ended, Sinead had checked into a hospital for depression, saying she was "routinely misdiagnosed" as bipolar.

In reality, she said, she suffered PTSD stemming from her childhood. Now it seems she's singing a different tune and believes her problems are more serious.

"As you all know I had a very serious breakdown between December and March and I had been advised by my doctor not to go on tour," O'Connor writes.

"So stupidly I ignored his advice to my great detriment, attempting to be stronger than I actually am. I apologize sincerely for any difficulties this may cause."

The Grammy winner says that she hopes to be well enough to attend a planned Curtis Mayfield tribute at Manhattan's Lincoln Center in July.