Doctors and nurses on the front lines are running on empty, under increasing duress as the pandemic surges and hospitals are overrun with patients — Dr. Shannon Tapia, a geriatrician in Colorado, near her home in Denver, Nov, 13, 2020. At one long-term care facility she staffed, 22 people died in 10 days. Photo: Daniel Brenner for The New York Times By Katherine J. Wu About 2 a.m. on a sweltering summer night, Dr. Orlando…