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Lolanne I am so sorry you had this terrible accident happen to you. I can personally relate for having a similar road accident in the spring of last year. I was lucky to be alive, very shocked and still get triggered so I suggest you avoid watching any drama programs on television lest they stir up memories.
You are very brave, commendably so, but will find it difficult to relax. I cannot stress how important it is that you see a therapist to help you deal with the PTSD, insomnia, distress and anxiety you may be facing at this time. I recommend you talk to your primary care doctor and get their advice, and better still a referral to a therapist who specializes in advising people harmed like you have been.
There is a possibility that your driving insurers can find you a lawyer to get advice on what to do next. Maybe the police could take this up and take out a prosecution on the guy who caused this accident.
I will hold you up in my prayers.