So sorry for your loss.
Losing a child is the hardest thing my wife and I have ever gone thru. I've lost my parents, a sister and 2 brother in laws. But nothing prepares one for losing a child.
Our 25 yr old son collapsed in the tractor. Autopsy revealed he had an enlarged heart but that was not ruled as the cause of death. We never did find out the official cause.
You just never get over it, we learn to live with it.