Sharon was diagnosed with colon cancer in 2002, reported Contactmusic.
"Sharon is the strongest woman I know. When I saw the scans of the colon, I thought, 'No way'. The cancer was so aggressive.
"She had three chemotherapies a month and after nine months the side-effects got worse and worse. She was having seizures - she was like The Exorcist, bouncing around the bed. I thought I was going to lose her," he said.
Ozzy, 65, who had a long battle with alcohol addiction, is still worried about losing his wife.