Elon Musk Details ‘Excruciating’ Personal Toll of Tesla TurmoilElon Musk Details ‘Excruciating’ Personal Toll of Tesla Turmoil

Elon Musk was at home in Los Angeles, struggling to maintain his composure. “This past year has been the most difficult and painful year of my career,” he said. “It was excruciating.”

The year has only gotten more intense for Mr. Musk, the chairman and chief executive of the electric-car maker Tesla, since he abruptly declared on Twitter last week that he hoped to convert the publicly traded company into a private one. The episode kicked off a furor in the markets and within Tesla itself, and he acknowledged on Thursday that he was fraying.

In an hourlong interview with The New York Times, he choked up multiple times, noting that he nearly missed his brother’s wedding this summer and spent his birthday holed up in Tesla’s offices as the company raced to meet elusive production targets on a crucial new model.

Asked if the exhaustion was taking a toll on his physical health, Mr. Musk answered: “It’s not been great, actually. I’ve had friends come by who are really concerned.”