Speaking to the Daily Mail from his 12th century Oxfordshire home, Gibb revealed he was given the shocking news after seeing a specialist for recurring stomach cramps.
After an examination and a scan he was told he had one hour to live unless he had immediate surgery.
Gibb told the paper: 'I told the surgeon: 'Hang on, I’ve only got cramp'.
'But he said I’d actually got an intestinal blockage and it could be about to burst. The way he put it to me was blunt: 'The only way out for you, pal, is through the operating theatre'.
'I was petrified. I’d never been in hospital before. I had the op there and then and after three days felt a lot better.'