Maintain a state of "mindful awareness."
The tendency when something bad happens to us, like the death of a loved one, is to detach from our physical, emotional and social selves. To "get numb, and stay that way" - but this effort to separate ourselves from what's happening isn't always in our best interest. Instead, you should seek to be "mindful": to keep your awareness on the present moment (not the past, and certainly not the future); all the while acknowledging (and accepting) your feelings, thoughts, and bodily reactions to your loss. Only then can you, in the words of Reinhold Niebuhr's Serenity Prayer, accept the things that cannot be changed, have the courage to change the things which can (and should) be changed, and the wisdom to distinguish the one from the other. Certainly, you cannot change the fact your loved one has died; but you can change (at least to some degree) the way you react to the loss—and that takes a certain sense of mindful self-awareness.