In Illinois, harassment and discrimination with regard to hiring, termination, promotion, compensation, and other terms and conditions of employment is prohibited on the basis of sexual orientation, gender identity, race, color, religion, sex, national origin, ancestry, age, order of protection status, marital status, physical or mental disability, military status, or unfavorable discharge from military service.
Since some categories above are not protected by federal law, it is imperative to seek legal assistance as soon as possible to understand the time limits you have to file your complaint.