Celine Dion battled stiff person syndrome and took dangerously high levels of Valium to manage symptoms and perform. In an interview with NBC News, she revealed taking up to 90 milligrams a day and risking her life due to tolerance buildup. Dion stressed the importance of medical guidance when tapering off the drug. Despite facing muscle spasms and rib fractures, she remains determined to return to the stage for her fans. Dion's struggle with SPS is explored in the upcoming documentary "I Am: Celine." The singer's openness about her health journey sheds light on the challenges she faced and her resilience in overcoming them.