Emilia Clarke nearly died after suffering a major stroke when she was just 24.
The Game of Thrones star, 32, was unable to remember her own name after the devastating brain haemorrhage that left her in intensive care.
The terrifying health scare happened in 2013, shortly after she had finished filming the first season of the hit fantasy show.
Clarke has revealed she was struck down with a headache at the gym and then collapsing and being violently ill before being rushed to hospital.
She underwent brain surgery and spent several days intensive care, but she eventually regained her power of speech.
In a piece written for the New Yorker , she explained: "The diagnosis was quick and ominous: a subarachnoid hemorrhage (SAH), a life-threatening type of stroke, caused by bleeding into the space surrounding the brain. I’d had an aneurysm, an arterial rupture.
"As I later learned, about a third of SAH patients die immediately or soon thereafter..."
After leaving intensive care she, was left suffering the severe after effects of the stoke, which included problems with memory and speech.
She added: "One night... a nurse woke me and, as part of a series of cognitive exercises, she said, 'What’s your name?'
"My full name is Emilia Isobel Euphemia Rose Clarke. But now I couldn’t remember it.
"Instead, nonsense words tumbled out of my mouth and I went into a blind panic. I’d never experienced fear like that."
She recovered and left hospital just weeks before she was due to start filming the second series of Game Of Thrones.
Emilia told the show's producers about her terrifying health condition, but decided to keep it secret from fans.
She battled symptoms including fatigue during the filming of the next two seaons of the show, as well as a stint on Broadway.
Emilia had a second brain surgery in 2013, which failed and she suffered a brain bleed that nearly killed her.
It meant she had to go under the knife for a third time for another life-saving operation.
After spending a month in hospital, she recovered but was left with titanium plates in her skull and a huge scar on the back of her head.
She has now declared she's 100 per cent fit and healthy and grateful to have survived her ordeal.