Indiana and Illinois are both members of the Drivers License Compact (DLC) meaning that Indiana informed Illinois of the OWI conviction you received for the OWI in IN. As members of the DLC a state can place the out of state violation on your driving record and chose to place penalties on you as if the violation had taken place in your home state.
The IL Secretary of State (SOS) keeps records of the traffic violations and accidents you accumulate while a resident of Illinois. The SOS in fact notes that if you are convicted of a traffic violation while driving in another state, the offense will be included on your record as though it happened in Illinois.
In Illinois, as in most states, driving under the influence (DUI) is a serious offense. If you are convicted of DUI in IL, the offense will permanently remain on your driving record. If you are arrested and/or convicted, you may lose your driving privileges and be fined and/or imprisoned.
The first DUI conviction will result in the loss of your license for a minimum of one year. You also may be fined up to $2,500 and given a jail sentence of up to one year.
Normally a DUI conviction in Illinois also subjects you to filing Financial Responsibility Insurance (SR22) for three years. Before your driving privileges are restored, you must undergo an alcohol/drug evaluation and successfully complete a rehabilitation or alcohol/drug education program and/or meet other requirements.
You stated that your license was revoked, so you may want to seek legal advise from a lawyer specializing in this field of law to help you find out if there is a way to get this penalty reduced and also to find out if that is the only penalty you will receive or if more are to come from Illinois.
You can check to see if moving to Indiana would help you be able to obtain a driver's license again but it is likely that the IN Bureau of Motor Vehicles would require you to get your Illinois license reinstated before you could apply for a driver's license in Indiana.