Demi Lovato says new doc about overdose shows her ‘deepest, darkest struggles’

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On the heels of the trailer for the docuseries "Demi Lovato: Dancing With the Devil" being released, in which the singer revealed for the first time that she suffered three strokes and a heart attack amid the OD, she spoke about the YouTube doc on Monday's "Ellen DeGeneres Show" — and her hope that it helps others.