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.
But marriage goes in waves. You've got to be patient. People bail and give up on their marriages way too early. They just don't put the work and the effort into it. You've got to suck up your ego a lot of times because that can be a big downfall.