CHICAGO — The last time Urban Meyer entered a season leading the No.1 team in the country, it nearly cost him his life.Fresh off Florida’s 2008 national championship season — its second title in three years — Meyer was starting to feel the toll of success and heightened expectations. The Gators were overwhelming favorites in 2009, but the stress of it all got to Meyer.He lost 37 pounds that season and twice suffered health scares that eventually led him to briefly step away from the program.