I can’t offer you any real help or advice, but I do totally understand your struggle – I’m going through something similar. The only thing I can suggest is to consolidate your debt – is that possible? I did a couple of years ago and it does make things a little easier.
Being a single parent is tough, I feel guilty for the long hours I can work but I hope my son will appreciate it when he’s older – everything I do is for him and it sounds like you are the same.
I hope things get better for you and thank you for doing such an important job.