I agree, time to start formulating a plan B. I would start looking for alternative babysitting resources, perhaps you could trade off services with someone. I remember what a nightmare it was to make sure the kids were taken care of just so I could get to work. I found that alot of my daughter's friend's parents were very helpful and we exchanged babysitting services. It saved me a bundle of money.
I am so sorry for all the stress and craziness in your life. Keep going forward, no expectation = no disappointment. You can do this, all for the greater good.
Just breathe, take care........