Not sure I understand your question. Sounds like you may have settled with the other driver. You may have the ability to make what is called an Underinsurance claim if you have that type of coverage. I need more info to evaluate your situation.
You may have a case for malpractice. You should have an experienced medical malpractice attorney evaluate the case. The medical record will need to be reviewed by an expert. This should be done as soon as possible. Sorry to hear of this.
Is this something that happened because of a fire event or something that occurred over time? If fire, it may be a good case and you should contact an attorney. If not, it sounds difficult. Either way you should get advice. Good luck.
If you are still having pain that you relate to the collision you should get treatment. It should be covered by your car insurance medical coverage. If you have continuing issues I believe you should consult an attorney for help with valuing and settling your case. Good luck.