If you were injured at work and cannot work for the rest of your life, then you must prove it.
In Illinois, the injured worker has the burden of proof.
Usually the only way to prove you cannot work anymore, in addition to showing all your medical problems, is to do an exhaustive job search.
It can take 4 to 6 months, sometimes longer, to look for a job and record the results.
This will take time and energy but it will be worth it if you can no longer work and are awarded lifetime benefits.