What to do next. After a slip and fall in a supermart there was a police report and I went to the hospital My knee is hurt and swollen?

there was spilled juice all over the floor and I fell. They said their insurance people would call me. I took the ambulance to the hospital and they took xrays Knee is not broken but hurts and is swelling up. I am a dancer and because of this I am going to have to miss a very important dance performance and competition. I am so upset over this. What should I do now? Wait for the insurance company to call or should I be looking for a lawyer now? I am mad enough to sue but I do not know how