Spaniel are they doing a post mortem on Alex? Or is it classed as a miscarriage because it was technically at 16 weeks?
If the latter, then in the absence of things like placental abruption or PE, then there is nothing anyone could have done. It's one of those heartbreaking things, and would have been set in stone from the day the sperm met the egg.
That doesn't make it any easier to bear of course.
I recently found out that although the reason my daughter died wasn't my fault, with more immediate action on my part, she might have been saved. That is hard to bear. But daily, I bear it, some days I don't even remember it, and we get through.
Just like you will get through this. It's possible there will always be something missing, there is for us, a huge hole in my family. But over time, the edges of that hole soften, and the rest of the family slowly start to cover it up. It's always there, but less raw. More of a scar than an open wound?
Of yourse you want your Alex, that will never change. He is your second wee boy, your second child, and that won't change either. If the day comes that you do want another, that will be your third child, not a replacement in any way. And if that day comes sooner than you think, don't feel guilty. Sometimes rainbow children (baby after baby loss) are the only thing which help us to heal. Filling those empty arms can be a great comfort, and I hope that DS1 will be a help there.
I'm rambling a wee bit now, but I wanted you to know that your feelings are totally normal, and not self indulgent at all. Again I would direct you towards sands forum for more specialised support and advice.
You will be normal again, I promise. Over time, you will find your 'new normal' - and it will be ok. The day will come when you laugh and enjoy yourself, and even better, the day will come when you laugh and enjoy yourself without feeling guilty afterwards.
It's early days yet and you will still have the flood of hormones to contend with along with your grief. Be gentle to yourself, and keep posting x