'My Heart Will Go On' singer Celine Dion says she is postponing some tour dates due to health diagnosisFighting back tears, singer Celine Dion shared in a video to fans she has been diagnosed with an incurable neurological disorder. Speaking out on Instagram, the 54-year-old Canadian native said, "As you know, I've always been an open book. And 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 talk about everything that I've been...