The actress blames her demise on her destructive relationship with her father Michael Lohan, the stress of life in Hollywood and the trauma of her split from first love Wilmer Valderrama.
The 19-year-old, who was admitted to hospital on Monday suffering an asthma attack in Miami, Florida, claims her bulimia became so bad, those close to her warned her she would die unless she sought help.
She says, "I was making myself sick. I was sick. I had people sit me down and say, 'You're going to die if you don't take care of yourself."
She lost so much weight the world's press began speculating she was suffering an eating disorder.
The crunch for Lohan came after an appearance on comedy show Saturday Night Live last May, when producer Lorne Michaels confronted her.
She says, "I just started bawling. I knew I had a problem, and I couldn't admit it. I saw that SNL after I did it. My arms were disgusting. I had no arms."
Her mother Dina stepped in after a paparazzi photo shoot showed her looking alarmingly skinny.
She adds, "I looked at it and was like, 'Jesus Christ.' My sister, she was scared. My brother called me, crying."
Lohan doesn't reveal details about her drug use, confessing only to trying "a little" but insists, "I've gotten that out of my system."
But she confesses to becoming a shopaholic to ease her pain--once spending $100,000 in one day.
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