Celine Dion’s sister says the singer is suffering uncontrollable “spasms” as she continues to battle her incurable stiff person syndrome. The ‘My Heart Will Go On’ singer, 55, revealed her diagnosis in December, which forced her to pull the plug on her ‘Courage World Tour’, and her older sibling Claudette Dion, 74, has now said she is devastated there seems little she and the singer’s family can do to help her “strong” sister or “alleviate her pain”. Claudette told HELLO! Canada: “She’s doing everything to recover. She’s a strong woman. “It’s an illness we know so little about. There are spasm…

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