I am so sorry to hear of your (similar) situation. Even though I am going through it as well, it is still sad to hear of the pain others go through, especially the children.
My D8 is also going through a rough time. Yesterday, she had a big meltdown in the bookstore and ran out down the street. My S16 had to chase after her and put her in the van. We had to lock the doors because she was just wild with anger. It was so hard to deal with especially since I knew it was because she is also stressed and hurting. My S5 had a "shut down" at school on Friday and wouldn't move for an hour. My S16 is feeling the stress and responsibility of wanting to look after all of us and be the "man of the house". I told him that one thing has not changed: I am the parent and he is the child. It is MY job to look out for him. He needs to live his life. I remind them all that even though things are rough in our family life right now, we have a lot of love in this house and that is never going to change. It will go with us wherever we go and we will always have each other.
I try so hard to avert their attention away from the negative things happening to us. But it is so hard. My H came home 2 wks ago for the weekend and we felt so complete with him here. But now, as the time gets closer for us to move out with very little money, we are all feeling the tension and anxiety.
He told me that he went on a date last Saturday. He said he had to find someone because he has to move on. Broke my heart.