Grimes was admitted to a hospital days after she made her cameo on Saturday Night Live, with boyfriend Elon Musk.
The 33-year-old let fans in on her mental health struggles and told her Instagram followers how she ended up getting hospitalized after suffering from a panic attack following the show.
She posted photos of herself striking a pose with Miley Cyrus backstage at the comedy show when her longtime partner was hosting.
"Forgot to post these cuz I somehow caused myself to have a panic attack and went to the hospital yesterday which tbh was quite scary and I suppose it's a good time to start therapy [three expressionless-face emojis]," she wrote.
"But nonetheless - wowwwww mileycyrus is good live and so chill!" she added.
She also heaped praise on the Tesla CEO, saying: "So grateful to the SNL team for being so kind and letting me sneak in as princess peach snd so proud of my beautiful E (which I know will upset the grimes fans so I apologize in advance) but he killed it.”