Unfortunately, you won't be able to seek additional compensation from the other driver or the other driver's insurance carrier because when you accepted the settlement you signed a release.  In order to receive a settlement, you gave up your claim (release of liability) against the opposing party.  You cannot sue again on the same claim.  You cannot go back to the insurance company and ask for additional compensation since the case has been settled.  Sometimes the amount of a settlement can provide compensation for future medical treatment discounted to present value; for example, when the medical reports indicate that future treatment is anticipated or will be necessary.If the doctor who treated you for the auto accident injuries missed the pinched nerves, it is possible that you may have a malpractice claim against that doctor; however, depending on how many years have elapsed since you became aware of the pinched nerves, you may have missed the statute of limitations for filing a malpractice claim against the doctor.