So so sad to hear this heartbreaking news.
very glad to hear you have a friend with you.
Another widow here; DH died suddenly (after long illness, but his death came as a shock nonetheless). 3 children aged 9 to 18.
I remember the early days of grief as a daze, in shock. Accepted many offers of help from family/friends I trusted for several days, including offers to stay overnight. They supported all of us, and left me free to try to support the children.
Be kind to yourself in every way.
Grief is a very strange process, and right now you'll more than likely be in shock. I found these days a turbulent emotional ride, and just moved in my daze from minute to minute ; however, everyone's experience is different, that's something else to know and hold onto.
My experience was that I remember thinking i was going quite mad after about 3 days because I was so deeply unsettled, emotionally surging and utterly unravelled. My gp helped me hugely by saying that although this sense of insanity isn't 'normal' for our everyday lives, it is 'normal' for grief. That gave me a really helpful perspective, and I slowly learnt to cope with the emotional turbulence over time, with lots of support from friends. You might find this perspective helpful too - maybe not.
Also remember getting 12 copies of the death certificate; needed most of them.
Sending you much love.