I think its bets to use some time to mourn and reflect upon what has happened, and then move on thinking how lucky you are to be alive!
I've felt this vitality sometimes when people close to me die, like some lifeforce is passed on to the living upon someones departure, I think that's a nice thought anyway. 
Don't distance yourself from such things, it'll only come back stronger, these things are best handled right away and properly.
If there is a memorial service or something similar, use that time, walk among those who knew him the best and just learn a little of what he left behind, it could put things in perspective and alleviate some of the shock!









