Sharon has been there with loneliness. 17 years ago, before she became a coach, she would "just have dark thoughts for days. I could 'Darth Vader' my entire life," she says.
She would have arguments "for hours" in her head with herself over the validity of the "doom and gloom" thoughts: "I'd make myself laugh but I'd also realise the nature of how little control I was demonstrating on my mind."
Sharon finally broke the cycle by catching herself going to the dark side and replacing it with the next stage, "which was productive loving."
She wrote paragraphs out of a book "full of amazing ways of looking at a the world", which introduced her to accessing "kind, compassionate" language.
"So I'd write it out and every time I went to the dark side, if I remembered to catch myself, I'd pull out my card and read it to myself.
"I remember thinking, 'That's bullshit, I don't believe it, the world's not that good.' The I'd try to read it again until I could read a paragraph of something kind without me arguing with it."