https://www.theguardian.com/technology/2018/aug/17/elon-musk-says-past-year-has-been-excruciating-and-worst-is-yet-to-come

In emotional interview, Tesla founder says he has endured ‘the most difficult and painful’ time of his career

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.