What should I do if I was assaulted by a customer at work and became injured and then was fired from my job in the same week non-work related?

I was assaulted inside the warehouse that I work in by 2 customers and then the attack continued outside the building, its on surveillance camera and seen by the police who responded to the 911 call. My employer didn't call 911 until after the men were finished attacking me and got away. These men were from the gym next door and the gym owner was present for the attack and just watched and laughed and didn't do anything to stop it. As a result of this I have many deep cuts and scrapes and a fractured rib and can't do any heavy lifting causing me to be unable to work. I was out if work for a week and the employer told me not to file for workers comp. The gym owner has been dodging the detective for questions & when I went to pickup my paycheck after missing a whole week of work I was fired because the gym owner pulled up and I wrote down his license plate for my own safety and he called my boss who then called me and fired me 10 minutes later. What are my options?