He’s 75 years old now and his blood pressure spiked so much during a recent game against Wake Forest they had to put him on an IV trip at half-time. He earns about $10 million a year coaching basketball and spends inordinate night hours alone watching game film, not sleeping, forgetting to eat. He is sometimes priestly, sometimes profane, he carries rosary beads and for 41 seasons he has been the public face of Duke, the private college that represents a few acres o …