Celine Dion’s new documentary, “I Am: Celine Dion,” features an immensely emotional moment in which she experiences a horrific seizure for many minutes.

The scene begins with the Grammy-winning singer’s doctor conducting an evaluation, since she had been having spasms caused by stiff person syndrome, a rare and progressive neurological condition.

Celine Dion is seen suffering a seizure in her new documentary, “I Am: Celine Dion.”

Terrill Lobo, a sports medicine therapist, notes that the condition can cause contractions to remain in place if the signal to release them is not recognized.

The incident begins with her experiencing spasms as a result of her stiff person syndrome.

After he has her lie down on a massage table, Dion, 56, continues to spasm, which Lobo says could “lead to a crisis.”

Shortly after, the “My Heart Will Go On” singer begins to have a full-blown seizure, prompting the doctor to summon another member of his medical team and administer Valium, a nervous system medicine.

Dion can be heard groaning in pain as she shakes, face down.

When Lobo attempts to lift her onto her side, the “All by Myself” singer begins sobbing and wailing.

In one startling scene, Dion appears wide-eyed and unable to move on her own.

Medical experts immediately treat the singer with Valium.

She is given at least two doses of nasal spray.

Dion appears visibly in pain.

However, she is still conscious at this point because she is able to slightly signal that she is alert by squeezing one of the medical expert’s hands.

Tears then flow out of Dion’s eyes as she continues to spasm. When Lobo asks her to try to “calm down,” the “That’s the Way It Is” singer starts crying and then sobbing even louder.

After administering two doses of a nasal spray, Dion starts to come out of the seizure, but the doctor says if she hadn’t, they would’ve had to rush her to a hospital.

Once Dion is seemingly back to her old self, she tells everyone in the room that incidents like that make her feel “so embarrassed.”

“I don’t know how to express it, like, it’s just … you know, like, to not have control of yourself?” she asks.

Tears could be seen streaming down Dion’s face amid the seizure.

Afterward, she says she feels “so embarrassed” by what took place.

Dion says during seizures she is unable to have control of her body.

Lobo explains that what likely triggered the seizure was the fact that she had been in the studio singing shortly before and her brain “was overstimulated.”

“Well, what am I gonna do?” the “Power of Love” singer then asks. “… If I can’t get stimulated by what I love, and then I’m gonna go onstage and, like, you’re gonna put the pulse oximeter on me and you’re gonna turn me on my back?”

Lobo responds, “It’s scary, I know. It’s hard. This is not the end of your journey — we all know that. But this is always that step on that journey.”

Dion’s doctor says her seizure was triggered by her singing in the studio.

The pop superstar then wonders how she will ever get back onstage.

However, Dion has said several times she is determined to sing again for her fans.

Dion and Lobo end with her singing Wyn Starks’ “Who I Am,” an R&B and soul ballad with lyrics like, “I’ve been closing the door / All my life, held it in but not anymore / Got two feet on the floor / This is it, I’m stronger than ever before.”

In the poignant Prime Video documentary, which released Tuesday, Dion reiterates what she has said numerous times since confirming her stiff person syndrome diagnosis in December 2022: she wants to return to the stage.

Because to her illness, the “Because You Loved Me” singer had to reschedule tour dates in Europe, postpone her Las Vegas residency in October 2021, and cancel her North American tour many months later.

Dion revealed her diagnosis in December 2022.

Dion revealed her diagnosis in December 2022.

Last week, she made her red carpet comeback.

“I Am: Celine Dion” is now streaming on Prime Video.

However, Dion has shown signs of improvement in recent months and may be closer to performing again.

The “A New Day Has Come” singer made her first public appearance in years at the 2024 Grammy Awards in February, and she most recently looked stunning in a sleek Dior gown for the premiere of her documentary.

She told her doctor, in tears, “If I can’t run, I’ll walk. If I cannot walk, I will crawl. But I will not stop.”

“I Am: Celine Dion” is available for streaming on Prime Video.