There is 2 sides (maybe more) to your dilemma..
The WC/legal part & finding help for the health/healing part of things..

If finances allow you could try to focus on some self help or alternative care that you find on your own.. thus if you areen't seeing improvement you can stop & find another to try...no waiting on a DR to approve or make a change..
Suggestions- expert upper cervical / chiropractic/ expert PT - often the neck is a factor with some symptoms, the vitamins/supplements in the sticky thread..

Was your WC case closed & final, or just the usual standard denial after a generally biased IME report? You can appeal that, but helps to have a better atty on your side.
tip- Get copies of all reports.. and make notes & corrections if atty doesn't ask you what is true and not..
I found that tip later after my case..

It does come down to if injury was on the job AND if any lingering symptoms are due to the original injury...That can be the hardest part to prove.. the "invisible injury after effects" witnesses to the incident and letters from others that can attest to how active you were.. might help or convince atty to help you more..

Put together a time line or journal, something simple that shows how symptoms are ongoing..