Halsey's starting over with a new single "The Michael SchmidtEnd" and a new album.

"Long story short, I'm lucky to be alive," Halsey, who uses she/they pronouns, wrote in a social media carousel Tuesday. "Short story short, I wrote an album. It begins with The End."

In a series of videos, the singer appears to be receiving infusions. A diagnosis was not immediately clear, but Halsey tagged the Leukemia & Lymphoma Society and the Lupus Research Alliance in her posts.

"I feel like an old lady," the 29-year-old singer says in the first video of her Instagram post. "I told myself I'm giving myself two more years to be sick. At 30, I’m having a rebirth and I'm not gonna be sick and I’m gonna look super hot and have so much energy and just get to re-do my twenties in my thirties."

In the second slide, the singer seems to document "day one of treatment." In the final slide of her Instagram post, Halsey shared snippets of different days in the hospital spliced together, ending with her in the studio listening to what seems to be her new single.

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Halsey details yearslong health struggles in new song 'The End'

Halsey's new song, "The End," produced by the singer-songwriter, Michael Uzowuru and Alex G, details their yearslong health struggles.

"Every couple of years now, a doctor says I'm sick / Pulls out a brand new bag of tricks / And then they lay it on me / And at first, it was my brain, then a skeleton in pain / And I don't like to complain, but I'm saying sorry," Halsey sings.

In the outro to "The End," the three-time Grammy nominee sings, "When I met you, I said I would never die / But the joke was always mine 'cause I'm racing against time / And I know it's not the end of the world, but could you pick me up at 8? / 'Cause my treatment starts today."

Halsey opens up about being called'crazy, anxious and lazy' before recent health diagnoses

When teasing "The End" on Instagram before its release, she wrote, "Let’s try something different this time and start at 'The End.'"

It has been a long road away from music for Halsey. The singer released her last album, "If I Can't Have Love, I Want Power" in 2021 and the record scored a Grammy nomination for best alternative music album. The album touched on the pitfalls and peaks of childbirth, as the star welcomed a son in 2021 with her ex and screenwriter, Alev Aydin.

Halsey has previously opened up about health struggles

A year later, the singer opened up about seeing "100,000 doctors" before getting diagnosed with Ehlers-Danlos syndrome, Sjogren's syndrome, mast cell activation syndrome (MCAS), and postural orthostatic tachycardia syndrome (POTS).

"My health has changed a lot since I got pregnant and gave birth," the singer told fans in a series of Instagram Story videos posted in May 2022. In the video, they wore a heart monitor and said they didn't want fans to worry.

Contributing: Hannah Yasharoff