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.