Besides an SSRI, I use exercise and RET (rational emotive therapy) to manage my trauma symptoms.
RET is a technique developed by Albert Ellis to stop irrational thinking and destructive behavior. It involves recognizing irrational feelings and addressing them cognitively. It is very helpful. (It can be difficult to do. There are days when I'm feeling like "Fuck RET. Fuck it right in the ear.")
Exercise helps a lot. A whole lot. I have a lot of anxiety and that can ramp up into hiding out and doing nothing. Anxious energy is part of a fight or flight response. I do both fight and flight. I go to karate once a week; on off days, I punch a bag at the gym. I also run 3X week. It alleviates both depression and PTSD symptoms for me.