It ain't over until God says it's over. Meaning that god is the final decision maker no matter who thinks they are in charge, and sometimes god allows a miracle comeback to happen. In the past there have been times when all hope has been lost and yet with the lord's help success was achieved. When Daniel was in the lion's den and the lions were ready to pounce god interceded and Daniel was not attacked. This is just one example of many in the past where god has stepped in and the outcome changed. God created the universe and only he will decide when to end it, there is no higher authority anywhere.
When god does decide it is over there is no arguing or pleading, you must submit to god's will in all matters. Death is not the end though, it is just a step in the next phase as you move forward. God is everywhere and in everything, and when you pass from this world you move on to a place that is far better. There is no longer any fear or pain, just the greatest joy you have ever felt and a sense of love and belonging that lets you know you are finally home with the Lord.