The 71-year-old underwent an operation in the US after he was diagnosed with prostate cancer, and was given the all-clear in October.However, Connolly's wife Pamela Stephenson has now revealed the funnyman suffered a terrifying health scare shortly after the surgery, when he developed a potentially deadly blood clot in his thigh.Stephenson claims doctors initially failed to spot the clot, and she saved her husband's life by ignoring their advice and getting him to a hospital straight away.She tells Weekend magazine: "I knew it was a clot, but the doctors weren't listening to me. Eventually I spoke to an intern on the phone, who said: 'Just get him to the hospital right away.' I threw him into a taxi; he was in agony and crying with pain as the driver drove up the highway from our home."After the clot was treated, Connolly suffered another scare while he was filming his TV documentary Billy Connolly's Big Send-Off, and it was his daughter Amy, who worked as a researcher on the show, who spotted the signs and took him to hospital.Stephenson adds: "Thank God Amy was with him. She recognised what was happening and they got him back to hospital to deal with the clot. He's had all his check-ups and he's in great shape now."