Hello, goinguphill, I am so sorry that you have lost Alexandra. And how unlucky too to have had a CS scar rupture and an EMCS.
I have lost 2 babies - at 13 and 20 weeks - to conditions incompatible with life (different ones) and thus have terminated twice. I still struggle to believe that I did this, and it's been years since I lost my two babies.
I just wanted to say, briefly, that I understand the tension between holding it together for DC (and feeling guilty about that) and needing to cry. I remember, the day after I lost my second angel, we went to Toysrus with DD1. It felt utterly wrong and surreal to be doing that, and carrying on, as though the world should have stopped when my baby did.
I got pregnant again soon after both losses. The first time, it ended with the second termination, at 20 weeks. The second time, I managed to have a healthy baby, now nearly 10 months. Had either of my lost babies made it, I wouldnt have her, and that is unthinkable now. But it also makes me feel guilty in a way. Mind you, motherhood is always hand in hand with guilt in some ways, anyway.
I think guilt goes with the territory. What we did goes against every instinct and feels so wrong, even though it wasn't and isn't.
Time does make things easier. But IME the whole experience of loss like this profoundly changes how you see everything, including yourself. Cuddle your DC closer, let the normality be for now (there is so much time ahead in which you can and will cry) and take each day as it comes.
Oh and post here, cos people get it...