When you are about to say anything around the topic that reminds you of your trauma, either have a question/topic ready to switch to or talk about something shallow and positive relating to it. For example, if trauma comes up, mention how there is more representation for mental health issues in tv shows that are really positive and nuanced like silver linings playbook where they really work on their mental health issues and are imperfect people. Then you might push the conversation towards tv shows you watched and enjoyed.