Over the years I've taken a lot of my trigger-topics and formed light-hearted ways to talk about them with other people. So if they come up in conversation I can say something rather "happy" sounding and then move on. Inside I'll be triggered and upset, but outwardly I'll be talking fairly normally.

It doesn't work so well if the person knows more information already, because then I sorta panic cause I don't know how to hide things. So sometimes I'll get angry or do what I can to switch the topic. haha.

Basically, I'll say or do just about anything I can think of to avoid talking about something that makes me feel too uncomfortable and will do ANYTHING I can to make sure I don't cry.