Harvesting Christmas trees is a physically demanding job -- chopping and hauling pines that can weigh as much as 200 pounds. But for migrant workers who come to North Carolina for the annual tree harvest, the strain is often an emotional one. That’s the finding of a nonprofit based in Cullowhee, called Vecinos, which provides healthcare services to migrant workers. “I see a lot of anxiety and depression,” Janet James, a nurse practitioner with Vecinos, said. “They’re living in a bubble for