I am very sorry this has happened to you. You and your family are in my prayers now.
Please, please, don't let this aweful illness leave you a victim as well. While there is nothing to do now but wait and see what will happen try to focus on the needs of you and your children. Request someone from the social services at the hospital come talk with you about your options and choices.
If your husband has been employed your children will be entitled to draw his SS benefits. There are places out there that will help with final costs as you mention about funeral and burial. Don't lose hope and site of a tomorrow.
Don't take this sitting down and let your entire life be destroyed. Find your inner strength. Do it for Davey, for yourself but most especially for the children who will never really understand what is going on and why their life is in such an upheaval.
Focus on what you can do and you will get through this, albeit tattered and torn but on the other side. Miracles can and do happen.
Be still, and know that I am God .. Psalms 46:10
:aww