I think a lot of people in academic programs like yours are triggered by at least one class or assignment. There are just so many people with personal experience that go into the field. You are lucky in that you have the support of a skilled T who can be there to help you work through it. You don't have to disclose however, right? It's probably good for you as a future clinician to bring all that raw emotion to the surface (with your T) so you can start to intellectualize your experience more- even become desensitized? There's nothing that says you have to share more than you feel comfortable with in your classes though. Believe me, some people do fabricate a little or a lot in assignments like this if writing about your own experience is too much to handle. So long as you process it in your own time so you can do the real work, you'll be fine. It must be terribly difficult but eventually your experience will enable you to be a huge asset to other people who need serious help.