Dion shared that she had been diagnosed with a “very rare” progressive neurological disorder called stiff-person syndrome, surely the first time that most people had ever heard of it.
“As you know, I’ve always been an open book,” she said in an Instagram video. “I wasn’t ready to say anything before, but I’m ready now. I’ve been dealing with problems with my health for a long time, and it’s been really difficult for me to face these challenges and to talk about everything that I’ve been…