Fiona Apple has been through a lot for someone so young, and the singer has now opened up about suffering from mental illness, specifically obsessive-compulsive disorder.

Spinner reports Apple told Elle magazine that her OCD got so bad that it got to the point where she was thinking about the well-being of her trash. "I had really bad obsessive-compulsive disorder," Apple said. "At its worst, I was compelled to leave my house at three o'clock in the morning and go out in the alley because I just knew that the paper towel roll I threw in the recycling bin was uncomfortable, like it was lying the wrong way, and I would be down in the garbage."

Apple's OCD still presents roadblocks for her while she tours in support of her new album, 'The Idler Wheel Is Wiser Than the Driver of the Screw and Whipping Cords Will Serve You More Than Ropes Will Ever Do.’ "I'll be going to [Los Angeles venue] Largo to see my friends ... [and] I'll start freaking out, and it won't stop until I'm actually there," she says.

Meanwhile, Apple made a rare television appearance on 'Late Night With Jimmy Fallon' earlier this week. She talked about her infamous stage breakdown in 2004 and then performed her new single, 'Anything We Want,' with the Roots. Watch Apple's 'Late Night' interview and performance here.