I have hesitated to post this, but it keeps preying on my mind, so I'm just going to go ahead and do it. I hope you don't take offense.
I know you fear the possibility of having to tell your daughter that her mother has died. That is understandable. But, I keep wondering which you think would be worse for her? Finding out her mother has died, or finding out that you died. You have mentioned that this is affecting your own health.
I had real bouts of panic during my sleep last night, my chest was tight and my heart would race.
I woke up this morning and I was dizzy. ...this empty feeling in my head and I felt like two bells were clanging inside my skull. It has since passed, but I think the extreme stress...
Again, I hope you don't take offense, but I do think it's something you might want to think about? Your daughter needs you.