If I slipped, fell and hurt myself in a hospital but they won't call me back, what action can I take?

I was visiting my brother in the hospital. The floor in his room had been mopped while we were in the room. He asked me to get him a pillow, (he was sitting in a recliner) off the bed. I walked from the couch to the bed then to the recliner to put the pillow behind his back. On the way to the couch I slipped and fell on a wet spot. The cone was at the entrance into the room behind me. I was already in the room. I had back surgery in Oct.2011, 8 screws, and rod put in my back. I am on disability. I have now had neck and problems with my left arm due to this fall. I have been to my surgeon, had x-rays and now I am going to see the pain management doctor about shots again in my back. I have contacted the hospital several calls, they tell me they will have someone call me. They never have contacted me. When I fell a nurse did a report, told me I would be contacted. Never heard a word. I am sure I will need a lawyer in Missouri since I live in Arkansas. Due to being on disability I cannot afford to pay up front. I need a lawyer that gets paid if we win. Do you think I should proceed with this matter?