If you do get to go back to work, keep looking, keep interviewing for those other jobs. The best way to leave a job is to go to another one that you really think you'll like better.
Seriously, they're not just being mean to you, you are having attendance problems. From now on, be very careful to follow their call in requirements, call every single day if it's required, even if you are on sick leave with FMLA approved for it. And any time you are out for a health related reason, yours or your child's, make sure you have a doctor's statement. Yes, it's sort of silly and redunant to keep running to the doctor for every little thing, but in your situation, it will be that LAST absence they look at, only, and if they fire you when you have a doctor's note, that will enable you to be more likely to be approved for unemployment insurance. It may have nothing to do with their policies and may not be required by them, but unemployment is the area where having that doctor's statement for your absence is going to help you.
If you are put back to work, you don't have to quit your claim, don't do anything else about it until they have called you back to work. Keep making the weekly certifcations until the first week Sunday through Saturday that you have been working and have made too much to draw. For exacmple, if they say, "Come back to work starting this MOnday," you will still certify, this coming Monday, for the previous week's unemployment. You then just stop qualifying for weeks, and that's what will stop the claim.