Lady Gaga revealed in a new Rolling Stone cover story that her psyche was unraveling during the making of “ A Star Is Born ” and in the months afterward while on her “Joanne” world tour. As the pop icon bluntly admitted: “I did ‘A Star Is Born’ on lithium,” referring to the drug used to treat and prevent episodes of mania.

“There was one day that my sister said to me, ‘I don’t see my sister anymore,’ ” Gaga remembered. “And I canceled the tour. There was one day I went to the hospital for psychiatric care. I needed to take a break. I couldn’t do anything … I completely crashed. It was really scary. There was a time where I didn’t think I could get better.…  I feel really lucky to be alive. I know that might sound dramatic, but we know how this can go.”

Gaga was in one of the busiest

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