overwhelmed sad angry all at the same time

Went for another ultrasound yesterday and our two hour visit became three as we found out we are expecting not just twins but craniopagus twins. Feeling so incredibly overwhelmed, upset that this has happened, feeling like this is my fault because my egg couldn't fully separate, and hurt because now we will have to make a decision in a few weeks that I never wanted to have to make. How can we go from being incredibly excited but nervous about mono mono twins to now faced with the complications of conjoined twins and whether we want to terminate pregnancy based on severity? All this after being told that this pregnancy will need to be my last because my damn uterus sucks and can't handle another? Oh did I mention these would be the only kids for my SO? Feeling like a failure, feeling lost but loving my babies so much already that I'm hurting. Sorry just needed to vent and get things out there. Every time my SO and I try to talk about what's going on I break down and start crying, just as I am now and he's struggling too.