I think the fear of the dark is a fear that almost all children have; I was one too, so I understand.

On the other hand, the fear of losing those we love, I think, is something that's been with us since we became aware of our surroundings, and that with time, we come to understand that it's a fact of life and that we should just enjoy it, love our special people, and pray a lot that God keeps them healthy and alive for as long as He decides. I really enjoyed reading your post, greetings!