By Seamus Duff Jamie Oliver says he is battling to get back in shape after secretly suffering from a painful health condition for four years. The 48-year-old celebrity chef \- who is married to 49-year-old model Jools with whom he shares five children; Poppy, 21, Daisy, 20, Petal, 14, Buddy, 12, and River, seven – was left in agonising pain after suffering from multiple slipped discs. The medical condition is caused when the soft cushion of tissue between the bones in your spine pushes out – and can result in lower back pain, neck pain, numbness and tingling in the shoulders, back and feet, mu…