EXCLUSIVE! 'RHOC' Star Vicki Gunvalson Recalls 'Scary' ATV Accident: 'I Really Thought I Was Going to Heaven'

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From high-end thrills to life-threatening chills, season 11 of The Real Housewives of Orange County is going to be one wild ride -- literally.

The new season, which premieres Monday, June 20 on Bravo, will give fans a firsthand account into the shocking off-roading accident that caused housewives Vicki Gunvalson and Tamra Judge to be rushed to the hospital.

Back in April, while filming for the Bravo's flagship series, Vicki, Tamra, Heather Dubrow and new housewife Kelly Dodd were joyriding on all-terrain vehicles in Glamis, California. With Tamra at the wheel, the vehicle hit a sand dune and then rolled over multiple times with the reality stars trapped inside.

MORE: Tamra Judge & Vicki Gunvalson Hospitalized in Sand Dune Accident

"It was probably the scariest thing to ever happen to me," Vicki confessed to ET's Brice Sander at the RHOC premiere event on Thursday. "I don't know what happened other than the fact that we started rolling. I think we were on the side of a dune and going a little too fast maybe."

Kelly, who was sitting next to Vicki in the back seat of the ATV recalled the "very scary" details of the moment. "We rolled up a dune, and [Tamra] turned the wheel a wrong way and my helmet fell off. We rolled [and] Vicki slammed into me," she said. "The roof fell in and it slammed into Tamra's head."

Quickly after the accident, Vicki was airlifted away from the site of the crash by an emergency helicopter, while Tamra was rushed away in an ambulance. Both women were taken to the nearest hospital.

"I really thought I was going to heaven," Vicki revealed. "I just kind of thought, 'I'm at peace with my life, I've accomplished everything I want. I've got two great kids and two great grandkids,' and all that stuff started going through my mind."

MORE: 'RHOC' Star Vicki Gunvalson Shares Post-Accident Recovery Photo and Health Update

While at the hospital, both Vicki and Tamra were diagnosed with concussions, while Heather and Kelly managed to walk away from the incident with minor scratches and bruises.

"What started out as a super fun, amazing time and renewed friendships turned into a near-death experience and one that I still have nightmares about," Heather spilled to our cameras. "[It was] very, very scary, especially since my son was on the trip with us. You don't see that in the trailer, but he was in another dune buggy watching it happen, so that had a whole other layer to it."

Earlier this week, ET also visited Vicki's home in Coto de Caza, California, to get an update on the "residual effects" Vicki has been dealing with for the past two months since the accident.

"I get waves of dizziness, and I have a huge forgetfulness," Vicki shared. "So, I called my doctor and I'm like, 'Is this normal?' He's like, 'You had a major head trauma. It could take six months to a year to feel totally normal.'… Maybe it won't ever be normal. I don't know."

"When you look at the scene of the rolling and all what happened to me, and Tamra, and Heather, and Kelly, we all were in the car together. For some reason -- maybe because I'm the oldest -- I got hurt the most," Vicki continued. "But we're very, very fortunate. I mean, God, definitely, my mother, whoever was watching over us. I mean, you don't really, typically survive stuff like that."'

Season 11 of The Real Housewives of Orange County premieres Monday, June 20 at 9 p.m. ET/PT on Bravo.