I was driving on 2nd Street and realized I wasnât going to make it through the light, so I stopped. I noticed that I had stopped in the crosswalk, so I decided to back up. Before backing up, I checked everythingâI looked in my left mirror, my right mirror, behind me, and also at the rearview camera. There were no cars in sight behind me. As I started backing up, I heard a beeping sound indicating there might be a car behind me. I checked my mirrors again and looked at the camera, but there was still nothing there. I continued backing up and kept hearing the beeping sound. I checked againâmirrors and cameraâand still saw nothing, so I kept going. I sped up slightly. Then suddenly, within seconds, my car slammed to a hard stop. It was a very abrupt emergency stop that caused my head to jerk forward and backward. It felt like someone had hit me from behind. Right after, I looked at my dashboard and saw multiple red warning lights and messages indicating that an emergency situation had occurred. I immediately checked my rearview mirror and side mirrors again, but there were no cars behind me at all, only vehicles beside me on my right hand side that were going straight, since I was in a left-turn position. I am in hospital because of my pain. I have pain in my neck and head , Iâm dizzy, the room is spinning, Iâm nauseous. My nose is stuffy and I feel like I have cold, and my vision is blurry.