Kristen Johnston in London on Feb. 5, 2007.(Photo: Sang Tan, AP)
(USA TODAY) -- Kristen Johnston has revealed on her Facebook page that she finally has an explanation for why she's been feeling so sick.
She was diagnosed this week with "a rare form of lupus called lupus myelitis." Lupus Myelitis is a complication of the lupus involving the spinal cord, according to the SLE Lupus Foundation.
"I'm not trying to be 'coy,' 'relevant' or 'get attention'," writes Johnston, 46. "I just was diagnosed 2 days ago ..."
Earlier in the week, she wrote that she had been experiencing "full body muscle weakness" since September. It was so bad that the actress, who won two Emmys on 3rd Rock From the Sun and currently stars on TV Land's The Exes, wrote that she needed a "neck brace to hold my head up."
Johnston says it took four months, 17 doctors and "two-fun filled weeks in November partying at the Mayo Clinic" before she was finally diagnosed this week.
Now, she adds, "I'm not on my death bead ... far from it. I'm gonna be fine."
She says she didn't share the news right away because she "just wanted to have a few weeks of privacy to navigate it & receive treatment." And the only reason she said anything, she writes, is because she will miss "a few episodes" of the show.