Emma Caulfield has multiple sclerosis. 

The 'Buffy the vampire Slayer' star recalled that "out-of-body sensation" 

she experienced after she was diagnosed following an MRI due to the advice of her acupuncturist after she noticed a range of worrying symptoms. 

She spoke to the readers of America's Vanity Fair magazine:"Once upon a time, I was free of health issues. 

In 2010 I had been working on executive producerof Marti Noxon's show 'Gigantic' prior to my start on the job

I awoke in the morning and my lower left of my facial felt as if there were thousands of ants crawling across the surface. 

The feeling you get when you've been in a position for too long? The feeling is gone, but it's returning like an explosion of blood.

Then it kind of disappeared, though I wouldn't call it totally numb.