Simon Cowell has committed to modify his lifestyle for the benefit of his three-year-old son, Eric, after disclosing that his catastrophic fall last week was caused by low blood pressure. The 58-year-old "X Factor" judge confesses he was lucky to survive after collapsing and going down the stairs. A doctor who treated him said Cowell had a 10 percent chance of survival. After weeks of absence, Cowell returned to Los Angeles on Thursday night where he attended the premiere of "The X Factor" season four at the Landmark Theater. The incident happened around 9:30 p.m. when Cowell went downstairs with his son to take pictures with fans. He told E! News, "We went down to say hello to everyone and took some photos. I then realized I didn't have my phone with me so went back upstairs to get it. By this time, little Eric wanted to go home so we called our driver and got in the car." Cowell added, "I then fell down the stairs. My wife found me at the bottom of the stairs in a coma. I think she knew something wasn't right because they were saying on TV that I had fallen down the stairs. She called our publicist who called an ambulance which took me to the hospital. I was told I had a 10 percent chance of surviving so I'm really happy to be alive."