Canadian singer Celine Dion revealed in an exclusive interview with NBC News' "Today" that she plans to return to the stage, even if she has to crawl. Dion suffers from "stiff person syndrome," a rare neurological disorder that causes spasms that affect her ability to walk and sing. Dion says she was terrified to perform while dealing with the disorder, but she is determined to return to form, stating "my voice will return, it's not going to be taken away from me." Dion also discussed her decision to disclose her diagnosis and how hiding her health problems affected her while she was struggling to raise her children and pursue her dreams, and support her late husband, who was battling throat cancer at the time. Dion will expand on her condition in the upcoming documentary "Celine Dion: A Life Story", set to be released on Amazon Prime Video on June 25th.