What can I do as I feel I was treated unfair due to not being able to go back to work and the injury was due to the workplace’s unsafe conditions?

Last year, I was employed by a contracting company to work for another company at their job site. On the job site, I was injured under unsafe work conditions. I went through almost two months of physical therapy and after a short while (2 weeks or so after injury) went to light duty at the contracting company office. Meanwhile, the other company was unable to take me back or refused to, after I was taken off of light duty (almost 2 months later, per doctor’s orders) and at the same time the contracting company was unable to find new job placement for me. I am now unemployed and that was the best paying job I have had.