There's really no such thing as the agony of dying. I'm quite sure that pain is shut off at the moment of death. You see something happens when the body knows it's about to go. Peptide hormones are released by cells in the hypothalamus and pituitary gland. Endorphins. They attach themselves to the cells responsible for feeling pain.
You never go into a marriage expecting to get divorced. You go into a marriage expecting it's going to last forever and you have a lot of ways you dream about the future. You have all these expectations and then you have to adjust those expectations and it can be a very unnerving confusing time.