But Most Importantly: have the injury documented by a medical professional (if you don't have access to one, call the street medics at 503-233-3194).
If you can't get in to see someone today, have a friend take a picture of the injury (if it's visible such as bruises, cuts, etc.) Use a film camera, if possible. It holds up better in court.
If you think you are experiencing symptoms of PTSD (post traumatic stress disorder), please call the medics, they will direct you to resources that can help.
Write down everything you remember NOW before you forget the details.
If you have pictures or videos of the incident, that is fantastic, however, don't post them on the internet. Sometimes this evidence can be used against you or other people. Please have someone at NWCRC or PLDN view the material. Pass this info on to everyone you know who had a camera or videocamera.