What can I do if the person that hit me disappeared?

2 Years ago, I went to a Jr. High School Campus to watch my granddaughter play a basketball game. I was walking along side of the gym, when there was a flash, and I was propelled 180 degrees in the other direction. The first thing I thought was I was hit by a car. The first thing I heard was a whosh, which was my breath leaving my lungs. It happened so fast, I was going the other direction, and I saw a cement post heading my direction. But, I went down before, I cracked my head on the post. Instead I cracked my head on the cement sidewalk. I had no time to get my hands out to break my fall. My right arm was across my stomach holding on to the strap on my purse, which was hanging on my left shoulder. Down I went, hitting my knees, my stomach, and my head. I saw the cement coming and there was nothing I could do about it. When I hit there was the last whosh of air that came out of my lungs. I could not breathe any more. I tried but I could not get any air. I knew I was going to die, and my granddaughter was on the other side of the wall, and I could not even say goodbye. Then I heard a voice say “are you okay?” all I could manage to say was I can’t breathe. The voice said, I will get help. It seemed like forever since the person left. But, then I found myself sitting up. I saw a person walking toward the gym. I tried to say, help me, I can’t breathe. She came over and tried to help me. I was getting little bits of air, enough to keep me alive. Then the ambulance, police, and fire trucks showed up. When I saw them I was so relieved. Then, there was my granddaughter, in my face crying. All I wanted to do was hold her in my arms. Couldn’t do that, my right arm was broken, both knees were damaged as the meniscus was crushed and pushed out of place. I had to have a full knee replacement. And getting ready for the other one. I had to go through the surgery without the general anesthesia. Due to the COPD w/asthma.
So the final outcome was: He runs me down, I seek medical attention, I had to pay anything medicare does not. I am still trying to recover from that incident. And where is the boy that ran me down? He and his parents have disappeared. My attorney (who is one of very best in the valley) could not find him or any traces of his family. Very common Mexican name in California. Somehow I have managed to move past it and I am still paying my portion of medical bills. I am 67 years old, and with my conditions now, I feel I have lost at least 2 years of my life. I am in fact still recovering. My life will never be the same.
What now?? I guess sometimes we just have to say “it is what it is” and life goes on.