Unfortunately, I agree with Tim and Hal. It is not uncommon for employers to ignore medical obligations in hopes of preventing increases in their workers' compensation insurance premiums. If you the employee delay too long in getting an attorney involved, you can end up getting burned a second time. If you are ever injured at work in the future (and I hope you are not), remember that 1 year is generally the time frame alotted for pursuing the claim fully in Georgia.
The insurance company can "close their file" to the extent it becomes less active, but it does not mean your rights have ended or that the file at the State Board of Workers' Compensation is closed. Medical treatment remains an option if it is related to the work injury. Talk to an attorney to see if you can get more out of the case than you have.
That is a very unusual scenario indeed. If in fact those benefits were paid under workers' compensation, as a general rule, a 15% late penalty is owed on any disability benefits not timely paid under the Georga statute, or 20% if the amount was awarded by an Administrative Law Judge at the State Board of Workers' Comp. But, again, a 20 year delay is very odd. You need to review this with an attorney more fully.
Pain and suffering are frequently excluded from workers' compensation. Ask your lawyer if it is allowed in your jurisdiction. As mentioned above, unless there is a product/machine defect at fault or other similar 3rd party negligence which would allow you to go after someone other than your employer, you will be limited to the the workers' comp claim against your employer. Good luck.
I would be careful not to mistake an insurance adjuster's assurances to you as a safe bet. Chances are that insurance won't make any decisions until they see the actual written doctor's report. You telling them what the doctor said is probably not enough. Also, the way you interpret what the doctor says, and how they interpret his report may not be the same. I recommend you consult a workers' compensation lawyer in your state to ensure your interests are being protected and the process is...