Footage has emerged showing the moment Mischa Barton began screaming about her mother and the end of the world, after she was allegedly given the drug GBH.
The OC actress, 31, was filmed ranting incoherently while standing on the fence in her backyard in LA.
Barton is seen suddenly crashing to the ground as she loses her footing and falls backwards.
The actress was voluntarily taken to hospital Thursday after neighbors found her screaming.
Barton said Friday she was out of the hospital after an overnight stay and had found out through doctors that someone had given her GHB on Wednesday night, while she was celebrating her 31st birthday.
GHB, which is often referred to as a date-rape drug, has been known to be slipped in alcoholic drinks, typically to incapacitate victims of rape or sexual assault.
In the footage, Barton can be heard shouting about planet earth, before saying: 'Oh my God, it's over. I feel it. And it's angry.'
She later says: 'We're dying, we're dying. I knew it, I knew it. I don't want anybody to know. Oh my god, it's terrifying.'
The actress is also heard shouting: 'Oh my mother. I always knew it. Oh you f***** witch. I knew it. What a witch. I was right, I was right.'
Towards the end of the footage, she shouts out 'Ziggy Stardust', the name of one her dogs.
Barton told People Friday that she went out with a group of friends on the evening of the 25th.
'While having drinks, I realized that something was not right as my behavior was becoming erratic and continued to intensify over the next several hours,' the actress aid.
'I voluntarily went to get professional help, and I was informed by their staff that I had been given GHB. After an overnight stay, I am home and doing well.'
Barton thanked the staff at Los Angeles' Cedars-Sinai Medical Center for their care.
'This is a lesson to all young women out there, be aware of your surroundings,' she added.
However, a source has now claimed to TMZ that Mischa was on a downward spiral for 'nearly a year' before checking into the hospital psych unit.
The site alleges that Mischa's neighbours claim she 'frequently' has loud crying and screaming fits, disturbing the peace.
Her next-door-neighbours are also reported to have complained about the star's loud parties and late night Netflix binges.
Law enforcement sources told TMZ Thursday that Barton had been voluntarily taken to the hospital for a mental health check.
Police and firefighters were called to the scene after being alerted about a jumper or possible overdose. Barton was wearing just a dress shirt and tie at the time.
Not long afterwards the Brit, who turned 31 just two days ago, tweeted: 'Thank you all for all the birthday messages Xoxo'. The tweet seemed to have been deleted as of Thursday evening.
It is not the first mental health episode Barton has been involved in.
In July 2009, after seeking medical attention for a tooth infection, the actress was sectioned for two weeks under a '5150', a Californian law that allows a psychiatrist to involuntarily confine a person deemed to have a mental disorder that makes them a danger to themselves and others.
She said at the time: 'If they feel you are depressed or a danger to yourself they can hold you on a 5150. I am terrified of needles and they wanted to pump me full of drugs and I said, 'No, absolutely not. I don't want to be here,' and got into a fight with the nurses, and that led to my 5150.'
It is not the first time Barton has blasted her mother Nuala either.
She famously sued her 2015, accusing her of defrauding her by stealing her money.
Last year she accused her mom of purposely holding up the sale of the $7million Beverly Hills mansion they co-own.
The 7,600-square-foot Tuscan-style villa, which boasts views of Catalina Island, was one of the focal points of the suit - with the actress claiming her mom gave herself co-ownership of the property without her knowledge or permission.
She accused Nuala of taking out massive loans against the house behind her back - and turning the home into her 'personal ATM'.
Barton even claimed she was then kicked out of the home by her parents who wouldn't let her back on the property.
That case was dismissed back in February with the terms of the agreement stating Nuala would sell the home.
Nuala had been her daughter's manager for years until the actress accused her mom of being a 'greedy stage mother posing as a talent manager'.
Barton's lawsuit included claims that Nuala had lied about her salary for a film and didn't pay her the full amount.
She also accused her mom of opening up a Mischa Barton fashion boutique in London and used the Sixth Sense actress's name to hawk a handbag line - yet Barton claimed she never saw a cent.
Nuala called her daughter's allegations 'nonsense' and the case was dismissed in February last year.
Both mother and daughter have had financial problems for years - so the impending sale of the home should bring much-needed relief to them both.
In her bankruptcy papers, filed in February, Nuala said her assets totaled $3,747,500 but her liabilities totaled $5,583,412.
She said her average monthly income totaled only $1,600 but her expenses were $27,618 - leaving her in the red over $26,000 every month.
The biggest asset listed in her bankruptcy petition was the Bowmont Drive property.
She said the current value of her portion was $3,747,500 with the total value being $7,495,000.
The petition stated her liabilities as $4,264,567 on the mansion, including an unknown amount owed to Barton.
Nuala spends $10,500 a month on the Beverly Hills home along with $12,200 in additional mortgage payments, $3,635 in real estate taxes and $600 in food & housekeeping supplies, according to the papers.
Last year, the actress – who has been trying to sell off the home for 6 years - listed it for sale at the price of $7.495 million.
Barton also listed it back in 2010 for $8.6 million and even tried to rent it out for $35,000 a month but nobody bit.
London-born Barton moved to the United States when she was five and began acting at age eight, appearing in hit movies Sixth Sense and Notting Hill before rocketing to fame in teen drama The OC.
However her glittering career came crashing down as her partying began to get out of control.
She was arrested for DUI in 2007, then two years later - following an intervention by her parents - she had a nervous breakdown and was held in psychiatric care after threatening to kill herself.
In 2009 her house went into foreclosure after it was revealed she had failed to pay her mortgage for five months.
The same month she was sued by producers of the movie Promoted, who claimed they paid her an advance but she never turned up for work.
Barton was then sued by her landlord over unpaid rent on her $7,000 a month NYC apartment in 2010 before suing her own mother five years later for 'theft' and 'breach of contract'.
Her legal troubles are believed to have left her homeless and broke.
She attempted a comeback on the most recent Dancing With The Stars - but was booted off after just three episodes.