Beloved singer Céline Dion faces a challenging battle with stiff-person syndrome, a rare neurological disorder that has forced her to step away from her music career. Despite excruciating muscle spasms, difficulty breathing and walking, and a nasal quality in her voice, Dion finds strength in her three sons and is determined to live with the condition. The Grammy winner, who opens up about her struggles in her documentary "I Am: Céline Dion," has had to cancel her Courage World Tour and undergo intense physical therapy and vocal rehabilitation. Still, she remains resolute in her desire to return to the stage, even if she has to crawl or speak with her hands. Dion's courageous journey serves as an inspiration as she fights to overcome the challenges of this debilitating disorder.