Washington Nationals pitcher Jon Lester says he knew something was wrong because he felt too sluggish last season during games and even between games while he was with the Chicago Cubs. He thought maybe he wasn’t working hard enough or maybe it was just because he was into his mid-30s. The left-hander long ago established himself as a workhorse who always started more than 30 games in a season. But now it turned out he needed surgery to remove one of his parathyroid glands. He had the procedure last week and now says he already senses a difference in his energy levels.