In her new memoir, Kelly Osbourne opens up about the terrifying night mom had a seizure and Ozzy overdosed

LOS ANGELES, CA - JUNE 05: Musician Kelly Osbourne, musician Ozzy Osbourne and Sharon Osbourne arrive at Spike TV's 4th Annual "Guys Choice Awards" held at Sony Studios on June 5, 2010 in Los Angeles, California. (Photo by Christopher Polk/Getty Images)

Kelly Osbourne, the daughter of rock star Ozzy Osbourne and Sharon Osbourne, is publishing her memoir, and one story is as terrifying as it is heartbreaking.

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In “There Is No F*cking Secret: Letters From a Badass Bitch,” Kelly writes about a night in 2002 when her mom, battling stage-three colorectal cancer, had a seizure; and Ozzy overdosed. According to her book, when Sharon was diagnosed, Ozzy went “insane” and started using drugs to cope.

“[One night] Mum had a seizure,” Kelly writes. “I finally called for an ambulance, and together with the idiot nurse, we got Mum stabilized.”

Kelly wrote in the book that she was terrified of what Ozzy might do on the night of the seizure.

RELATED: Ozzy Osbourne talks about nearly losing his marriage, rumors of a sex addiction

“I had reason to be scared,” Kelly wrote. “Dad was there in his boxers, and I watched him scoop his hand into a bowl of pills, swallow a handful of something, and then wash it down with vodka, like it was water and he was dying of thirst.”

Then they were all in the ambulance, she wrote.

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“[Dad] leaned over to and put his hand out and see if Mum was breathing. Then he passed out with his hand over her mouth, and it looked like he was trying to kill her.”

The paramedics, Kelly wrote, eventually got Ozzy off of his wife and actually wanted to call the police.

“I was sobbing and shaking, scared out of my mind,” Kelly wrote, “and the EMTs took pity on me and decided not to call the police, but said that they were rushing Dad into detox as soon as we got to the hospital.”

RELATED: Sharon Osbourne talks about her “terrifying” dog attack shocking miscarriage

Kelly, who is now 32 and has had her own bouts with rehab before becoming sober, recalled running between the two hospital rooms. Sharon recovered from the seizure and later the colorectal cancer, but underwent a double mastectomy in 2012, when she learned she was at risk of breast cancer.

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Since that night when Ozzy was treated for “a drug overdose and alcohol poisoning,” he continued to rely on drugs and alcohol. He wrote in a 2013 Facebook post that he was in a dark place and was not kind to the people he loves the most, his family.

In her memoir, Kelly also dishes on her own drug addiction.

“I had to make phone calls, sign papers, talk to doctors, console family members, and, at 19, make adult decisions that would have been hard for someone three times my age,” she wrote. “The only way I could even face my life was by opening that pill bottle, shaking out a few pills — or a handful– into my palm, and throwing them down my throat.”

Her book is set for release on April 25.

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