After going to rehab last September, Billie Joe Armstrong has given his first post-treatment interview to Rolling Stone.

The Green Day rocker opens up about his alcohol and prescription drug abuse and what made him decide to get finally help. "I couldn't predict where I was going to end up at the end of the night," Armstrong says. "I'd wake up in a strange house on a couch. I wouldn't remember how. It was a complete blackout."

But it wasn't until Armstrong's bizarre meltdown at the iHeart Radio Music Festival last fall that he realized he had a problem. When producers at the concert turned on a "one minute" sign left for their show, Armstrong began shouting and smashing his guitar on stage. "I'm not f*cking Justin Bieber, you motherf*ckers," he yelled. "Let me show you what one f*cking minute means."

Armstrong says he only remembers "tiny things" from the incident, adding, "The next morning, I woke up. I asked [my wife] Adrienne, 'How bad was it?' She said, 'It's bad.' I called my manager. He said, 'You're getting on a plane, going back to Oakland and going into rehab immediately.'"

Green Day's Billie Joe Armstrong is headed to rehab for substance abuse after his onstage meltdown at the iHeartRadio Music Festival on Friday.

"Green Day's Billie Joe Armstrong is seeking treatment for substance abuse," the band's rep said in a statement Sunday. "Green Day would like everyone to know that their set was not cut short by Clear Channel and to apologize to those they offended at the iHeart Radio Festival in Las Vegas."

The 40-year-old frontman went on a profanity-laced tirade after his band's performance was supposedly cut short.

‘‘One minute left, one minute (expletive) left. You’re gonna give me (expletive) one minute? ... I'm not (expletive) Justin Bieber, you (expletives)!’’ he screamed before smashing his guitar and storming off stage.

Armstrong was previously hospitalized in Bologna, Italy early September for an undisclosed illness.

Green Day has been a popular alt band since the '90s but they really broke into the mega-big time this century with American Idiot.

That's why we're kind of confused as to why they're choosing to promote their new album, 21st Century Breakdown, with shows all week on Last Call With Carson Daly!?!

I mean, you'd think they'd do the week-long stint on Conan, Dave or at least one of the Jimmy's, but the least watched show that airs at 1:30 am?