You need to go hire a family law attorney in Illinois who will discuss the details and current state of family law in your state with you. After this, the next step for you would be to file a motion to modify custody and bring these new developments to the attention of a family court judge. If you are unable to hire an attorney, most counties in California have a "family law facilitator" who will guide you through the process and help you bring the motion to modify custody yourself. I would hope that your state has equivalent resources for those representing themselves. Also, many law school have family law clinics that may be of assistance to you. Best of luck to you in resolving this matter.