I have been through almost exactly the same.
Our DDs Edwards was picked up at 21 weeks and so we had the termination at 22weeks. That was back in January.
Today is actually my due date!
It is and has been horrific. I have got through it with wonderful people around me and by seeing a specialist counsellor who deals with still birth and neonatal death.
Have you had contact with sands or arc? Both have provided me with much comfort and support.
Funny, I was the same as you, really nauseous and rough through the whole pregnancy, nothing like with my dd1. I also knew deep down something was wrong, I just couldn't imagine a baby at the end of my pregnancy.
I won't try to give you too much advice, often it seems very patronising. I will say contact arc and/or sands if you haven't already, allow yourself to feel whatever you feel at that time. I desperately tried to stop myself feeling guilt and anger, it didn't feel right but in the end I felt worse. You will have people who tell you shit like 'it was meant to be' or 'you just weren't meant to have thins baby' I know they're trying to be helpful but it's ok to day 'I don't find that helpful right now'
Have the hospital offered you a service? We had one and it helped hugely, we also have a plaque in our locals sands garden which helps as it's somewhere to go.
Your hospital should also offer you a 6 week appointment with a fetal medicine consultant to go through what happened and risks for the next pregnancy.
I'm so, so sorry you have been through this. I understand your pain and detestation. Pleas feel free to pm me if you want a chat, otherwise I'll keep checking back on this thread.
Have you named your baby btw?