Blake Fielder-Civil has revealed he thought Amy had passed away "in his arms" as the pair got high in London in August 2007.
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Blake, 27, claims he and Amy - who have been granted a decree nisi and will finalise their divorce in just over four weeks - had been taking heroin and crack cocaine without sleep for days when the singer collapsed.
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He told "I was terrified. We were sitting on the bed talking. Her eyes suddenly went blank. She started having a fit on the bed. I was panicking. I didn't know how to help her. I was out of it on drugs as well, and was sobbing and crying out, 'Amy
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She had an awful look on her face then suddenly she just passed out and stopped breathing. It was the most frightening thing I had ever seen. I felt sure I was watching her die right in front of me. I didn't know what to do or how to save her. I held her to me and I thought she was dying in my arms."
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Blake eventually "came to his senses" and started CPR (cardiopulmonary resuscitation), reviving the dying star.
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He revealed: "I was panicking but I somehow managed to open her mouth and breathe air down her throat. At first nothing happened then she spluttered and I saw her chest rise.