Sitcom star Kristen Johnston took to Facebook this week to explain why you won’t be seeing her in a pair of upcoming episodes of her series The Exes.

“I’ve been really, really sick since early Sept.,”; explained Johnston. “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.”;

“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 [sic] when you’re in a sitcom that requires tons of physical comedy.”;

The health issues resulted in the actress visiting 17 doctors in a four-month span, before being diagnosed with a “rare auto-immune disorder.”; (Johnston chose in the post not to disclose the specific name of the disorder.)

This medical concern resulted in Johnston missing two upcoming episodes of her TV Land series, although she did express that she was “finally on the right treatment, feeling better & back at work!”;, which is some fantastic news for comedy fans everywhere.