Have a look at this article from the National Counselling Society.
Extract: “It is a common myth to think that the term ‘lone worker’ simply refers to people who work completely alone. Although thousands of people do indeed fall into this category, the term ‘lone worker’ actually refers to a much broader spectrum of people – including anyone who works remotely, in isolation, with vulnerable people or, indeed, who can feel vulnerable themselves due to the type of work they carry out.”
Toni says: Don’t forget yourself. You are important. And things can get out of control quickly.