It took me 4 days before I was able to cry when I lost my loved one, before that i just felt totally numb, I still do to some extent. I think losing someone so quickly takes away the oppertunity to slowly ease yourself into accepting their mortality and it makes things so much harder. It is also completely valid to feel angry about what happened. It isn't fair and none of you deserved it. Your brain is trying to wrap its head around so many huge things it never though it would have to deal with, so right now its putting you in armour, until it has finished sorting things. Never invalidate what you are feeling be it conventional grief or not. Your body will cope with things in the way that is best for you, try to roll with it and just trust what you're feeling.