Fielder-Civil - ex-husband of the late Amy Winehouse - was rushed to a Dewsbury hospital in the days following the one-year anniversary of the singer's death after he was found choking on his own vomit in bed the morning after the alleged binge.
Sarah Aspin, the mother of Fielder-Civil's 15-month-old son, discovered the 30-year-old and has spent every day by his side since, as he tries to recover from a serious infection alleged to have resulted from a mixture of alcohol, morphine and heroin.
"The doctors say they don't know the prognosis. They said they put him in a coma to help him and due to infection," Aspin told The Sun. "I'm praying he'll survive, but I'm having to prepare myself that he may never wake up."
Doctors have told Aspin that Fielder-Civil may suffer permanent brain damage as a result of the incident and have said that he is still "critically ill".
"I am devastated, just devastated, at what has happened. I just want to cry all the time - but I have to be strong for our son Jack," Aspen confessed.
She also recounted the details leading up to the incident, saying: "We'd been so happy last Thursday morning and talked about getting married. Blake had a 1pm appointment with the probation service in Morley, and said he might be late as he was meeting a friend.
"He's never really been a drinker, but when he got home with this friend, he was slurring his words and staggering - I thought he was on something. I was very angry because he'd been doing so well. I had to get his shoes and trousers off to help him into bed.
"[The] next morning I went to get up and heard a horrid scratching and grating breathing sound. I looked round and saw Blake lying there completely grey. His eyes were rolled back and his mouth was locked together."
Aspen revealed that doctors found that one of Fielder-Civil's lungs was not working, and that he had tubes placed down his throat in order to pump oxygen into his body.