The problem with BPD is not the reminiscing, though we think of things much more and allow it to get to us too much. The problem we have is with what is called Radical Acceptance. Everyone feels pain, it's part of life. Most people are able to accept what's happened in short order and go on....those are people I envy. We, on the other hand, hold on and are unable to do that. Pain is feeling something that makes you unhappy, accepting it, and going on. Suffering is when you can't do that. A trigger is basically anything that would cause the suffering to return. Anything about self injury or suicide, or, for us, anything that brings back the memories. I'd be willing to introduce you to DBT therapy. What it tries to teach us is to live in the present; not to dwell in the past or worry about the future since there's nothing to do about them. It doesn't try to make you block out the feelings....that's actually harmful because they'll usually come back with a vengeance, but instead attempts to teach you to let the feelings go. I'm not the expert on DBT but will help if I can. Yahoo offers a free DBT class that I can give you info on, and PC has a DBT chat on Saturdays. PM me if you want and I'll see what I can do.