Kristen Johnston

Dave Kotinsky/Getty Images for NYCLASS

Kristen Johnston shared some very personal news with her fans yesterday.

The Third Rock From the Sun actress took to Facebook to explain in a lengthy post that she'd fallen ill, to the point where she found herself "almost completely unable to move." But it wasn't until 4 months and 17 doctors later that Johnston realized what the issue is. The celeb was diagnosed with a rare autoimmune disorder.

"I've been really, really sick since early Sept. Full body muscle weakness to the extent that just walking difficult, stairs impossible and I even need a neck brace to hold my head up," Johnston wrote. "Lying down I'm fine, which is great for writing or killing time on social media (thank you all!!), but it's kind of disasterous when you're in a sitcom that requires tons of physical comedy."

The Exes star continued to explain that she had to "begrudgingly" miss two episodes and explained, "This lucky lady spent 2 fun-filled weeks in November partying at The Mayo Clinic. Come on...Who's jealous?

"This is how, after 4 months & 17 Drs (no lie) I've FINALLY been diagnosed with a rare auto-immune disorder. Meaning my immune system has decided to go rogue & attack my muscles. The good news: I'm finally on the right treatment, feeling better & back at work!"

The star pleaded with fans to refrain from overreacting or offering any sort of treatment tips, and instead asked that they just watch tonight's holiday episode of The Exes. She then gave thanks to those who have been especially supportive during this difficult time.

"I gotta say, TV Land and everyone at 'the exes' have been just amazing, all of them…so patient, understanding, loving & supportive. It's true that when you're sick, you find out who your real friends are, and these people, along with so many others, like.....Oh Crap. This is starting to sound like a dreadful acceptance speech, so I'll just say you know who you are. Thank you & I love you."

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