When the coronavirus hit the U.S., hospitals issued strict limitations on visitors. Nurses and doctors started acting as liaisons to the sick and dying for family members not allowed at bedsides. As deaths reach new daily highs, that work is not getting any easier. The emotional toil of adapting to new dynamics with patients and families at one rural hospital in Livingston, Mont., is a case study of what health care workers are grappling with all over the country.