If you can not afford an attorney, then you should contact Cabrini Green Legal Aid, The Chicago Bar Association, the Legal Assistance Foundation, or the Women's Bar Association of Cook County.
You can also go straight to the State's Attorney and tell them you need "IV-D" help and pay the $25 fee and they will haul your husband into court for child support. You can afford that and the State's Attorney has lots of tools to get deadbeat dads to cough up child support. Here is an overview http://www.chicagoappleseed.org/programs/child_support_reform/study_of_cook_county_child_support_enforcement_division/overview applicable to Cook County.
So far, this is free to you. Until you pay a fee, I am not your lawyer and you are not my client, so you take any free advice at your sole risk. I am licensed in IL, MO, TX and am a Reg. Pat. Atty. so advice in any other jurisdiction is general advice and should be confirmed with an attorney licensed in that jurisdiction.