SURVIVING the PAIN

SHANIA TWAIN OPENS UP ABOUT HOW SHE MADE IT THROUGH HER EX'S CHEATING AND A SERIOUS HEALTH SCARE.

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SHANIA Twain wasn't in a forgiving mood. Asked about S the "other woman" who had an affair with her then-husband, Mutt Lange, ending their 15-year marriage in 2008, she didn't hold back. "I do really nasty things in my dreams to her," the 56-year-old revealed, noting that Marie-Anne Thiébaud had been her best friend and confidante. "I'm always cutting her hair or shaving it off!"

That betrayal is just one of many hardships the country superstar has survived. In a new Netflix documentary, the "That Don't Impress Me Much" singer also opens up about her painful childhood, the early death of her parents, and the Lyme disease that nearly destroyed her career. Making Not Just a Girl (accompanied by a compilation album of the same name) "was cathartic for her," an insider tells Star. "It was like a dam breaking."

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