Hi Lilac
First of all I wanted to send you lots of (((((hugs)))))
You've been through so much - not just the fact that you had twins but all you went through before and to get here. And then the traumatic birth on top of all that and looking after two babies and a little one. It's not a surprise that you are worn out! In a way I feel I can relate to your story because as you know we had a difficult journey to get here too and I also had a very fast, traumatic birth. It takes its toll on you and I think you're in shock for a while at first and suddenly everything can hit you. Especially with your husband going back to work next week, you're bound to feel anxious about that.
I agree with the others who said to talk to your HV. Sometimes all you need is for someone to listen.
I really hope you're feeling better soon :\)
Love NN and Olyvia xxx