If I was assaulted and struck in face was knocked unconscious and broke my ankle, what should I do sue the police department and guy who assaulted me?

A car blew threw a stop sign I got out of my car to make sure there was no damage. When I was struck in face by this man that blew stop sign, I was knocked unconscious and during me falling to ground. I broke my ankle and they left the scene. I have 3 witnesses that seen it all take place and the officer that took my case said I was in the wrong and that I should not have got out of my car. Should I get an attorney and sue the police department? I lost my job, had surgery 8 screws to rods and 2 metal plates in my ankle over this this cop was very rude and did not even take the 2 main witnesses statements. The guy even admitted to hitting me in police report.