Hurt - I was in precisely your position a little over a year ago - so many of the details, even down to the feeling so hot an going so unexpectedly - and on the same day of the week too are the same, although my DH only started to decline on the Sunday. It is an awful, awful place to be.
But remember you were with your beloved and he knew how much you loved him. You were right by his side. That is the thing that matters most of all.
Following the inquest into the death of my DH, I have realised/learned that his cancer was so advanced, all the help in the world, all the right or wrong support from the nurses (they told me my DH was fine too - the day before he died) would have made no difference to the eventual heartbreaking outcome. It is the cancer which destroys, there is nothing we can do to prevent that - no matter how badly we want to.
The pictures in your head will fade - mine have a little and I couldn't understand how they ever would. It takes time, but it does happen. It takes very little to sharpen them back up again, but they fade and memories of 'before' begin to sneak in.
I felt exactly as you do. Exactly. Isolated, frightened, bereft and traumatised. I send you enormous support and love.