Private letters from the singer's husband to his family have been published in News Of The World, as well as conversations with his "devoted" mother, Georgette Fielder-Civil.
Fielder-Civil admits he lives in fear of waking up and hearing his wife has died from a drug overdose, and says: "Every day I fear the prison chaplain is going to walk into my cell and break the news that Amy is dead."
Fielder-Civil also reveals that Winehouse is sometimes high on drugs when she comes to visit him in prison and regularly falls asleep during their meetings.
The 25 year-old warns his wife: "Quit smoking crack or you'll be dead in three months."
He also admits he and Winehouse were blowing $1,000 a day on heroin and cocaine before he got jailed--but reveals he has now cleaned up his act since being locked up.
Fielder-Civil now wants Winehouse to do the same and says: "I'm disappointed that Amy has been taking crack and I'm pleased she got caught, because at last she is going to get the help she deserves.
"I want Amy to grab this opportunity in rehab so we can have a marriage and future together. Because the way she's going I really fear I will come out of prison to no wife."
Fielder-Civil also details their the couple's problems with self-harm, before criticizing his father-in-law, Mitch Winehouse.
"I hate Amy's father, Mitch. My mother calls him the Fat Controller," he writes. "He is on Amy's payroll. What man takes money off his daughter? Mitch ought to be ashamed."
Fielder-Civil is on remand currently in London's Pentonville prison awaiting trial over allegations of GBH and trial fixing.
For more on Amy Winehouse, check out her NME.com page.
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