Here is some reading that is very well written and accurate; worth to share:
When talking about a child loss then "amputation" is a good analogy. Because unlike a bullet wound, when the amputation heals, the arm is still gone. So the hurt of grief is different from the hurt of other wounds. There is the pain of the severing, and then the relentless pain of the "gone-ness". The countless might-have-beens. Those too hurt. Each new remembered one is a new blow on the tender place where the arm was. So grieving is like and unlike other pain.