The 28-year-old has spoken about the ways her eating disorder led up to the overdose, but she's never gone into detail publicly about that night.
Well, the trailer for her four-part YouTube documentary series, Dancing with the Devil, dropped today. And she's breaking that silence.
"Any time that you suppress a part of yourself, it's gonna overflow," Demi says in the trailer.
Then, it cuts to shots of Demi partying with friends and yelling, "More!"
"I had three strokes. I had a heart attack. My doctors said that I had five to ten more minutes," the singer continues.
“I’ve had a lot of lives. I’m like a cat, you know? I’m on my ninth life."
"I’m ready to get back to doing what I love, which is making music. I’m not living my life for other people or their headlines, or their Twitter comments,” she states.
Today, Demi also shared the struggles she's faced since the overdose.
"I was left with brain damage, and I still deal with the effects of that today," she told People. "I don't drive a car, because I have blind spots on my vision."
"And I also, for a long time, had a really hard time reading. It was a big deal when I was able to read out of a book, which was like two months later, because my vision was so blurry."
"Everything had to happen in order for me to learn the lessons that I learned. It was a painful journey, and I look back and sometimes I get sad when I think of the pain that I had to endure to overcome what I have, but I don't regret anything."
You can watch the full Dancing with the Devil trailer here: