I am so very sorry for your loss and please extend this to all who have been affected.
I think denial will be with you all for some time as it was a sudden and unexpected death.
All you can really do is support each other and realise that there was nothing anyone could have done differently to prevent this, and accept any thing and everything that grief throws at you as " Normal for now" . And take each day as it comes.
When my husband died I needed to go and see my GP as I suffer from anxiety and depression from time to time and knew I needed some help to get through his passing, I was on medication for 2 years and it helped me keep going. Please don´t be afraid to ask for help in this way if you feel you need it. It didn´t stop me grieving, but it did stop me becoming immobile and unable to function due to anxiety and depression.
I know a lot of people will poo poo the idea of tranquilization but in my opinion if a pill a day keeps you going...take the pill.
I also leaned on those of my family and friends who empathized with what I was going through and steered clear of those who didn´t.
You will know that I believe our loved one´s never really leave us and they are with us in spirit always. Again not everyones belief but it´s a comfort if you can accept this even in a small way.
My thoughts and love are with you all.