“Once upon a time, I had zero health problems,” Caulfield told the publication.

That feeling when you’ve sat in a position too long?

The feeling’s gone and it’s coming back like a rush of blood.

Emma Caulfield in Buffy the Vampire Slayer and WandaVision

‘Buffy’ star Emma Caulfield revealed her MS diagnosis and ‘WandaVision’ return.20th Century Fox Television/Kobal/Shutterstock; Marvel Studios

But it was extremely dull.

I went to my acupuncturist, and he was like, ‘I don’t know, man.

Maybe you have Bell’s palsy?'"

At the insistence of her acupuncturist, Caulfield went to a neurologist for an MRI.

She received the call confirming her MS diagnosis when she returned to set.

“I had five minutes down or whatever.

And he was like: ‘You have MS.’ Just like that,” she recalled.

“It was like an out-of-body experience.

I’m like, ‘No, that’s not possible.’

I’m like, ‘What are you talking about?’

He was very matter-of-fact about it.

‘Well, you could get a second opinion…’ It was literally a kind of nightmare….

It turns out it was something major.

Then I was like, ‘I’ve got to go to work now.’

What do I do?”

I just have to keep going."

“It just touched on really basic human emotions, like a life blueprint,” she told EW.

“‘I don’t have any friends.

I feel isolated.’

Those sort of core human emotions.”