Ah, I'm late with my thoughts.
In my experience it was always some kind of baffling for the emotions whenever something severe happened.
Either the just new birth of my own child or the death of my parents: it was normal to feel NOTHING in the first moment. In case of my mother's dying: this moment lasted for two years.
It is very important, like some people here said before: Emotions are as they are and there is an own reason for this. There are emotions accepted or not accepted in society for certain situations in life. This expectations how one should feel are never helpful but often messing. We never really react in the standarts of Hollywoodfilms.
Also, when i was about to die nearly, i could only feel nothing. Seems, the emotions come later often.