Can I file a lawsuit for an injury that occurred 8 months ago?

I drive an eighteen wheeler, in February 2017 I slipped on ice while working a bounced my head between two trailers. I had a very large hemotoma to the back of my head. The incident was reported and I was seen in the hospital two days later. I was sent to a neurologist through workman comp. and supposedly cleared to go back to work in May 2017. I was suppose to have 2 follow up appointments with the Neuro doctor after I went back to work but my job refused to get me back in time for my appointments my driver advocate said that it was an unforseen timing when I told him 2 months in advance. I still have headaches, dizziness, my hands and arms go numb, and severe neck pain back in February they diagnosed me with concussion syndrome. These headaches are so debilitating and making it hard for me to work, I need to know if I can file a lawsuit this late or what I should do about getting the help I need.