Super Bowl-winning QB from San Jose faces constant pain and an uncertain futureHe rises from a chair next to his Heisman Trophy in a room stuffed with dozens of silver and gold keepsakes that recognize a remarkable sports legacy. At 6-foot-3, Jim Plunkett still commands a room. But underneath the tanned exterior anxiety grows over an uncertain future. “My life sucks,” said Plunkett, 69. “It’s no fun being in this body right now. Everything hurts.” The years of daily pain pulsating from the neck, back, knees, shoulders, hips and head have taken a toll on a quarterback who played 15...