That was such a beautifully written story, my goodness.
What adorable photos as well. As with you, my baby Twinkie passed away in my arms and I also tried everything to save her while she was sick leading up to her passing. It is perfectly transparent in your posting how much he and you both cared for eachother, and you still do and will.
I am 6 weeks into this nightmare of loss and while it does not get easier, it changes, and people here on this forum are so helpful, I am sure you will find some help in your feelings too.