Other than seeking assistance from a local attorney in your area, I am not sure there is much else you can do at this time. It seems like you have tried negotiations with the doctor and he is refusing to cooperate. I do not recommend trying to file a suit against a doctor or their malpractice provider without the assistance of a local experienced attorney. Malpractice actions are very difficult, expensive and time consuming. They often require the hiring or consulting of an expert witness. Also, it is likely that your statute of limitations period has expired. It is likely that you only had 2 years to file a cause of action from the date of the incident and by not doing so, you are likely barred from such now. However, a local medical malpractice attorney in your area can help you better determine this. I would try and talk to a few attorneys in your area about this and see if you can find any help. Most attorneys who handle these types of cases only charge on contingent fee basis - meaning no money is required to be put up front and their fee usually comes out of a settlement, if any. I hope this information helps. Best of luck!
NOTE: This response is general in nature and should not be considered legal advice. No attorney-client relationship exists or is formed by this information.