C4 disc replacement

So I've done the physical therapy and MRI and the neurologist says that I need to have help my headaches. There is damage to my cervical spine from an injury I received while working. I was walking up a ladder very fast and rammed my head into a ceiling that was lower than I thought. Stupid yes but it knocked me on my butt and had headaches ever since. That was a year and a half ago and the pain is keeps getting worse and I am about ready to go insane . I have told my employer I require surgery and they do not want to give me get it done. I'm at the end of my rope with these people and I'm about ready to talk to a lawyer or something because this isn't right.