Troubled singer Amy Winehouse insists her problems with drugs and alcohol stem from "boredom" and feeling like she has "nothing to live for".

In a rare interview with Rolling Stone magazine, the Back To Black hitmaker reveals that after her husband Blake Fielder-Civil was jailed on charges of assault and perverting the course of justice in November 2007, she felt like her life wasn't worth living.

The Grammy award-winning singer subsequently cancelled her U.K. tour and ended up in rehab in an attempt to kick her addictions.

She was also treated at a London hospital for traces of emphysema last week.

And Winehouse blames her downward spiral into drink and drugs on her current unhappy state.

She says, "To be honest, my husband's away, I'm bored, I'm young. I felt like there was nothing to live for. It's just been a low ebb."

But the star insists that although she was treated at a London clinic in March, she doesn't feel like she has fully completed a rehab programme.

She adds, "I've never been to rehab, I mean, done it properly. I'm young, and I'm in love, and I get my nuts off sometimes. But it's never been like, 'Amy, get your life together.'"