If you have insurance call the mental health number for a referral and ask them how many days they will pre-approve. After that, once you get in the rehab will usually work to get more days approved. At least that was my experience.
If you don't have insurance there are still places you can call in northern Illinois. Salvation Army, catholic charities.
You said you manipulated your way out of prior rehabs. Is this something you are worried about doing this time? Give it a chance. It was really helpful to me. Good luck.