If you're having no current complications from your appendix being removed other than a little soreness, you may not have much by way of legal recourse. Still, I might be wise to contact a lawyer in your area in case complications do pop up in the future.
If you develop future complications, you may have a case for medical malpractice, or at least lack of informed consent, meaning a doctor did not provide you with enough information before performing a procedure.Although I'm not a lawyer, I believe much of this relies on whether you suffered injury or damages based on the doctor's actions.
This is a link to a page explaining informed consent. It may help clarify your situation. Good luck.
(removed)