Billie Eilish has revealed she suffered from daily panic attacks for an entire week due to her relentless touring schedule.

Speaking to Rolling Stone, the 17-year-old explained that her poor mental health was the reason behind tantrum-like behaviour during a previous conversation as documented earlier on in the interview.

“That was one of the hardest weeks I’ve ever had. I’ve never felt more hopeless in my life,” the “bad guy” singer said, explaining that she’s never suffered from anxiety or panic attacks in the past.

“But that week, I had a panic attack every single night. I cried for two hours every night. It was really, really bad,” Eilish added.

The reason for her anxiety, she explained, was that she felt unable to cope with her tour schedule; Eilish has live shows scheduled around the world from now until mid-2020.

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“I just couldn’t take the fact that I had to leave again,” Eilish told the publication. “It felt like an endless limbo. Like there was no end in sight. And, I mean, it’s true: There really is no end in sight with touring.”

The teenager recalled one moment in particular when she was sat on her bathroom floor trying to think of something that she could look forward to.

“And I could not think of one thing,” she explained. “I thought for a long time, too. I was like, ‘There has to be something.’ But there was nothing.”

Eilish, who also revealed in the interview that she has a history of self-harm, added that at times she felt “unsafe” being on her own, adding: “I don’t trust myself when I’m alone.”

Despite experiencing a "random week of bursting misery”, Eilish explained that she feels more like herself now and is enjoying touring.

The musician also made a note of sitting down with her mother, who manages her, to plan dates for when friends could join the tour to keep her company, which she said is something she can “hold on” to.

“I have an amazing job, dude. I really do,” Eilish concluded. “The things I get to do in my career have just been unbelievable.”