In recent years her posts on social media have become increasingly unfiltered, often threatening legal action against former associates, referring to physical and mental health difficulties and discussing troubles with her family and children.
A spokesperson for the singer has since said that O'Connor is now receiving care and is surrounded by love: "She is safe, and not suicidal".
"I hope this comforts those of you were concerned", they added.
ANNIE Lennox has called for support for Sinead O'Connor after the Irish singer shared a worrying video online. Are there no close friends or family who could be with her to give her some loving support?
"My officers went over there after receiving a call about a video and a woman in distress", Captain Robert Kaiser exclusively told Radar.
"Hi everybody, I am posting at Sinead's request, to let everyone who loves her know she is safe, and she is not suicidal", the post began.
"I'm mentally ill and angry because no one cares about me", confessed Sinead in the clip that went viral, complaining that she lives alone in a cheap New Jersey motel.More news: Mercedes teases new Vision concept auto in short clip
More news: 'Grey's Anatomy' Season 14 Spoilers: Jo's 'Emotional Damage' Will Be Explored
More news: Asian stocks lower as US, NKorea nuclear tensions rise
The musician, who has been diagnosed with bipolar disorder, said she had felt alone since losing custody of her 13-year-old son and revealed she is suffering from three mental illnesses.
She said: "I am now living in a Travelodge motel in the a*** end of New Jersey. At that point she was gone and we never made direct contact with her". She said they were triggered after she thought of her mother who dies in a vehicle accident in 1985.
"We heard that she has since been checked in to a hospital, and we have made periodic checks throughout since". And there's absolutely nobody in my life except my doctor, my psychiatrist - the sweetest man on earth, who says I'm his hero - and that's about the only f***ing thing keeping me alive at the moment. and that's kind of pathetic.
The Independent reports that singer #Annie Lennox had seen O'Connor's video and found it "truly distressing".
"I'm fighting, fighting, fighting, fighting... to stay alive".
Earlier this year, US TV star Arsenio Hall dropped a $5 million lawsuit against Sinead in relation to a Facebook post in which she claimed he gave Prince drugs. "I know that I'm just one of millions and millions of people in the world that suffer like I do that don't necessarily have the resources that I have".