I wish that you didn't have to do something that makes you feel unsafe, but sometimes that's just out of our hands, isn't it. Well, I used to be a support aid for people with cancer, PTSD and/or major depression. When I was doing this, I had to be open for questions that would require honest answers. More than that, to introduce myself I would have to touch on my own experiences to show my understanding of their illness. I acted much like I do on this site. Sure, I talk about it and go as far as I feel comfortable with but don't allow any emotion to surface until later in private. If I begin feeling uncomfortable about something, I usually would let that person know and begin talking about something else that could benefit them. People are remarkably understanding at times. Other times, they want to keep "picking at the scab". That's when I would set a clear boundary and would simply tell them that I will talk about it but only in my own time. I didn't allow myself to feel any more unsafe than I already had to. It can make not only me uncomfortable but it can make the other person as well. I wouldn't talk about a lot because I refused to trigger the other person.
I don't know if any of this actually helps but it's all I can think of at the moment.