Demi Lovato has revealed in a new documentary that she was left with "brain damage" after suffering three strokes a heart attack.
Lovato, 28, was found unconscious at her Los Angeles home in 2018, following a long and public battle with addiction and mental health issues.
A month before the incident, Demi had released a song called 'Sober', which detailed her release after six years of sobriety.
The singer was administered Narcan before she was rushed to a hospital.
Watch the trailer for Dancing with the Devil below:[youtubewidget||https://www.youtube.com/watch?v=jTiiD8L811w]]
The star spent two weeks recovering in hospital before continuing her recovery at a rehab facility and sober living facility for several months.
In the documentary, titled Dancing with the Devil, the singer reveals that while the incident is public knowledge, no one knows quite how bad it was.
"I've had so much to say over the past two years wanting to set the record straight about what it was that happened," Lovato says in the trailer, later adding: "I've had a lot of lives. Like my cat, you know? I'm on my ninth life."
She explained that the stroke was so extreme that she went on to have three heart attacks and suffer minor brain damage.
"I had three strokes. I had a heart attack," Demi said. "My doctors said that I had five to 10 more minutes.
"I crossed a line that I had never crossed."
The singer's friend Scott Montgomery then asks: "Are we talking about heroin? Are we doing that?"
Demi can be seen hooked up to a hospital drip in one heartbreaking scene.
Lovato's friend, Dianna De La Garza, can then be seen crying as she says: "We're watching all of her blood come out of her body into a machine."
Demi tells the camera: "I was left with brain damage and I still feel the effects of that," explaining that she no longer drives as a result of the incident.
The 28-year-old has spoken candidly about her struggles with her mental health as well as drug and alcohol addiction, having begun using cocaine when she was just 17 years old.
Lovato had her first stint in rehab at the age of 18 and she has been diagnosed with bipolar disorder.
In the four-part documentary, the singer discusses the past traumas in her life and how she has been affected by the pressures of working in the entertainment business.
She explains: "For the past couple of years, I've heard a lot of stories about my life and what people think has happened. I wanted to set the record straight and reveal it all for my fans."
Dancing with the Devil is due to be released on YouTube on 23 March.