Hi glam- I am sorry that your H does this to you. I think you handled things so well. Have you ever discussed financial issues in C? It is a very precarious position that your H puts you in since if you tell him no then he may decide not to help you financially in the future.
After this situation settles, maybe you and your H should have a discussion about finances and try to come to an agreement. Is there a way to get him to acknowledge that if you were D, he would have to pay court ordered child support? Could you come to some kind of agreement that while you are living apart and now since your H has an income, his money is his and yours is yours BUT he needs to provide a monthly amount to help provide for his children? I would think the C be able to help in this situation.
Try not to get to stressed during the holidays and enjoy your kids as much as you can. I miss my kids being little especially this time of year. They grow up way too fast.