I struggled for a long time to get across what I was experiencing. What I found helpful was keeping a journal that I would share with psych-doc but no one else. Creating a timeline can help too. It can be quite difficult depending in the extent of your dissociation. But it can also help to pinpoint the most vulnerable phases and help you to recognise what caused particular ‘episodes’. Even taking a copy of posts here which you feel you can relate to. And even if you only say it’s like that but not exactly, it will still give T some idea of what you are trying to get across.