Even Madonna gets tired. At a screening of her concert film, “The MDNA Tour,” she admitted how strenuous going on the road was, revealing to Page Six: “I was a mess.” She added, “I would have my bad nights, and I would cry and I would say I don’t want to do this. Before every show, everyone came into my dressing room and . . . said prayers, and 50 percent of the time I said them, and 49 percent of the time I was crying, usually from overexhaustion. But there’s something about pushing yourself.”