So, I do have an answer for the overwhelming fatigue and trouble sleeping. We are pregnant again. The very early ultrasound shows there is at least a heartbeat, so I don't have to schedule a D&C right away. I go back in a couple of weeks for a full viability ultrasound. We'll see if we still have a heartbeat and if it looks like it could be brought to term. So, my third first trimester in a year.
We are trying not to get our hopes up. It's hard, especially as we had been ready to give up and enjoy the blessing our DD is.
In the meantime, I am trying to be easy on myself. Deal with work and let DH step up more at home without feeling guilty (which he has been more than willing to do). Maybe even treat myself to that watch I have been eyeing up for months.