Has your T called you back yet zooropa?
I've been doing some obsessing myself, and it's really hard to stop once you start!
I think the trauma work probably is a big trigger, it is for me too. It's kinda natural to want to punish yourself, especially when talking about trauma stuff. I go through times where I want to make the trauma I've experienced WORSE to validate the fact I'm a horrible person, etc.
Try to take care of yourself, use the HEALTHY coping mechanisms that you've learned to use to stay away from cutting, and try to keep yourself safe.