Hi
@butterfybird , and welcome to the forum.
I don't know what kind of help you are looking for, but if you want people to read what you have to say and sympathize with you, to try to support you, then you are in a good place for that.
The only thing that comes to me to say to you is that, while you have clearly been going through a very rough time, nothing truly catastrophic has actually happened yet. In fact, there have been several close calls, but with an OK end result. This has been terribly stressful, but at least you don't have lung cancer. Your granddaughter's surgery was successful. Your husband is getting what will hopefully be effective treatment. And possibly, since things have been going that way, your daughter's cancer will be able to be successfully treated as well. I hope so.
All that you can do is take the very best care of yourself that you can. If you are not OK, you cannot be there for your loved ones. So don't think it is selfish of you to take time for yourself, to do the things that nurture you or make you feel peaceful. Take a walk in nature if you possibly can. Read something you love. Eat a delicious healthy meal. Listen to some beautiful music. Whatever you can do to ease your worry and feel a bit better will filter through and also benefit those around you.
Hang in there, and feel free to come here for support. We cannot be there in person, but we can be there in spirit.