What can I do if the injury from work caused me so much pain which made me resign and now I am unemployed?

I was at work in a Ford Ranger pickup driving 30-35 miles per hour and a 15 year old threw a gallon of water from the 25th floor balcony of where he lived. The roof caved in and the windshield was crushed. I was full of glass all over, as that was happening the force threw my forward but I went against the force and turned to the left to avoid the glass getting on my face. At first I guess from the adrenaline I did not feel pain in my back but I went the day after to the hospital because I had glass in my foot. Six days later on 08/26/2009 I started therapy per my attorney but I did not get to finish it because my supervisor gave me a hard time about coming in to work about 30 minutes late after I advised him that I was getting therapy for my back that was in pain from the accident. I was never on worker's compensation for my back only that one time I went to the ER for the glass in my foot. I was afraid of losing my job so I stop therapy and fast forward to today I resigned from my job 10/01/2013 because the pain was too much as my job required me to walk for the 8 hour shift. Now I am unemployed and still in a lot of pain. Is there something I can do about my situation?