Sinead O'Connor cancels remainder of US tour

Those who were hoping to catch one of Sinead O'Connor's upcoming performances were disappointed on Tuesday, as the singer has canceled the remainder of her U.S. tour.

As a note posted on her website explains, the "Nothing Compares 2 U" songstress hasn't been feeling well.

"With enormous regret I must announce that I have to cancel all touring for the year as (I) am very unwell from bipolar disorder," O'Connor reportedly wrote in a note on her website, which was then reposted on an unofficial fansite. Her official website appeared to be suspended on Tuesday morning.

"As you all know I had a very serious breakdown between December and March and I had been advised not to go on tour," O'Connor reportedly continued. "But (I) didn't want to 'fail' or let anyone down as the tour was already booked to coincide with the album release. So very stupidly I ignored (my doctor's) advice to my great detriment, attempting to be stronger than I actually am."

O'Connor was set to play shows in Milwaukee, Chicago, Washington, D.C., Philadelphia and New York in the coming weeks in support of her ninth studio album, "How About I Be Me (And You Be You)?" which was released in February.

"I apologize sincerely for any difficulties this may cause," O'Connor wrote, adding that she does hope to perform at a Curtis Mayfield tribute event in July.

The past few months have been a rough ride for O'Connor, who went through a whirlwind 16-day on-again, then off-again marriage last December, followed by a suicide attempt and requests for help via Twitter earlier this year.