Tesla's stock falls sharply after Elon Musk reveals 'excruciating' year

Musk says he has endured 'the most difficult and painful' time in emotional interview as confession wipes billions off Tesla value

Elon Musk has said the past year of his professional life has been "excruciating" and that stress over his business had caused his health to deteriorate. To make matters worse, the confession wiped billions off the value of Tesla, the electric car company he founded.

In an emotional interview with the New York Times, the founder of electric carmaker Tesla also revealed that the pressures of work had caused him to spend his birthday stuck in the Tesla factory and almost miss his brother's wedding.