Gascoigne, who believed he was about to die, said that his body went into seizure during a detoxification treatment at an American clinic in Phoenix, Arizona.
Doctors had told the 45-year-old that it was the "worst detox" they had ever encountered, and doubted whether he would make it through the treatments.
"Three doctors didn’t think I would make it. It has got to inspire me to never let this happen again,” Gascoigne told The Sun newspaper.
"I’ve come through that - death. I was dead. I thought I was on my way out. I looked like a corpse. I was a total wreck."
Gascoigne, who has now returned to Britain after over a month at the Cottonwood centre, was in a coma for three days and admitted to intensive care.
The last-ditch move to Arizona came after a shambolic charity appearance in Northampton during which the star broke down publicly, shaking and sobbing on stage in front of a room full of fans.
Gascoigne, who has struggled with alcoholism for a number of years, was sectioned five years ago under the Mental Health Act.