Ok. Tricky situation. It isn't really fair on you and the kids, though. Have you sought a second opinion?
If your ex won't go to mediation, you could go yourself and you would still get the certificate to say you attempted mediation. If it goes to Court (hopefully not), you have evidence to say you tried.
Also, maybe you could try temporary contracts through recruitment agencies, whilst you look for a full time job. I did that and it kept the cash flowing until I found my current job. It pays well and can be as flexible as you need.
If your ex won't go to mediation, you could go yourself and you would still get the certificate to say you attempted mediation. If it goes to Court (hopefully not), you have evidence to say you tried.
Also, maybe you could try temporary contracts through recruitment agencies, whilst you look for a full time job. I did that and it kept the cash flowing until I found my current job. It pays well and can be as flexible as you need.