What can I do if anything after my shoulder was hurt by exterior door in a restaurant?

While attempting to enter a restaurant, I opened the exterior glass door and the door hinge caught and snapped the door back instead of opening all the way like it should have. When the door snapped back, my right shoulder slammed into the frame of the door causing me great pain. I was waiting for my husband inside the foyer and as he opened the door it did the same thing to him. We approached the counter and told the employee what had happened and recommended she go see what was going on with the door which she did. She said that the door was just fixed the day before and apologized. I asked to talk to the manager and he was out. When he finally came back to the restaurant he went over to look at the door but ignored me. I went to the counter after a while and asked to talk to manager. He came out from behind the counter and I told him that I thought it might be important for me to fill out an incident report and asked if he should call his attorney which kind of irritated me. He didn't even apologize or ask how I was! Anyway long story short, he didn't have an incident report and told me to just write up on sheet of paper what happened and gave me insurance information to send bill to. I developed a large bruise on my shoulder and started getting a burning aching sensation so I went to the doctor and they sent me to physical therapy which after 16 visits still has not helped. My PT says that I have possibly chronic inflammation. It seems that it is getting worse so I went to another doctor that has ordered MRI (still waiting to have it done). Well the insurance company sent me a letter saying that they did an investigation and that I was at fault because I walked into the door. It was not malfunctioning which is a total lie. They said I am covered under their NO FAULT policy which will cover $5000.00 medical only then I'm pretty much on my own.