Have either of your actually filed for divorce yet?

You need to provide additional information such as his current income and the income you could make if you went back to work full-time. What was your career prior to being a SAHM? Are you two still living in the same house?

In IL, if you are the custodial parent, he will need to pay you 28% of his net pay in child support. I am going to guess that is far more than $75 a week. You may even be eligible for SS.