Jules,
you are not alone and I'm sorry for everything that has happened recently.

You sound like a very caring and supportive person who is only look out for the best for everyone. Often times these people who will go out of their way to support others tend to put themselves on the back burner. Right now, I'd suggest put you as a priority, take care of you the way you would someone you love. I'm not saying to abandon anyone, you can remind them that you are there whenever they want to talk. But you can only control you. Try to take some time for yourself, read a book, take a bath, relax any way you can.

I don't have any kids so I'm not sure of any advice as far as how you can help them. Ditto for your husband/divorce issue.

So all I can really say is, take a deep breath, take it one step at a time. This too shall pass. And I know if might not seem very personable at first, but speaking to a counselor can help you sort things out, make a plan, and regain some stability. And they are experts listeners