I am a medical malpractice/personal injury paralegal. You have two years from the date you knew or should have known something was wrong. If you are planning on filing a lawsuit, contact an attorney. Consultations are usually free. The process starts with what is called presuit whereby a Notice of Intent, records, etc, are submitted to the adverse parties. If your injuries warrant a lawsuit, and your case is accepted by the attorneys, you do not pay anything to the attorney unless and until you receive a favorable verdict resulting in settlement monies being paid or if the parties settle before trial begins. Do NOT contact any of the parties involved doctors, the hospital, aftercare personnel, etc. (potential defendants) This is what attorneys are for.
The standard rule is that you have 2 years as of the date that the malpractice was in fact committed to file a notice warning the doctor you intend to sue. You must notify the doctor or the hospital before filing anything.