Yes you have the right to request this change. The honorable courts of Illinois pay great deference to the custody judgments that are in place. Courts do not wish to hear and rehear matters. Unless there has been an earth shattering change, you should contact an attorney to go over the issues but within a year, change is very rear.
Unfortunately, in the small space provided for questions one is unable to get a full background of the matter. In the situations such as you are explaining you should immediately seek the counsel of a capable attorney that practices in this area of law or if you cannot afford an attorney, you should seek a social service organization in your area. This answer is general in nature and does not form an attorney client relationship. If you would like to get more information on this topic or to establish an attorney client relationship please contacts my office.
This may be deemed an advertisement and as such: information contained within this answer has been approved by Bradley L. Schencker, a licensed attorney to practice law in the State of Illinois, for any questions contact Bradley L. Schencker by use of the methods provided herein.