Hey, L.. I FEEL YOUR PAIN! I have an 18-mo-old daughter, and I am about 11 weeks pregnant. Like you, I am very excited, but I just feel SO crappy that it is hard to be upbeat. I have terrible morning sickness (ALL day), and feel tired all the time too. My girl has never been a good sleeper either. I am used to being active and productive and creative...and I have felt worthless for the last two months! So far I'm just comiserating...not much advice, ha! But if you're like me, it helps to know someone is in the same boat.
One thing that helps me is workout. The intensity has taken a dive, but if I just make myself do SOMETHING I always feel better. As far as getting stuff done and being a good mom and wife...well...I think we just have to do the best we can and cut ourselves some slack. This rough stuff WILL end (hopefully by the second trimester), and we will be back to our old selves soon.
My husband is very helpful and doesn't put pressure on me...however, I do get some resentment from him since he is not used to doing anything "chore" related after work. I felt very guilty for a long time, but I have finally resigned myself to just thinking "tough toenails!" I might suggest you ask your husband to be on duty when your daughter wakes up at night (go to her bed, instead of vise versa). It is very importantant that you get your rest right now. You will make it up to him in a few weeks when you feel better. Also, even if your girl won't nap, maybe she could have some quiet time in her room with lights low and door closed (just remove dangerous stuff). She might even fall back into napping if she has to have an hour of low-stim. I TOTALLY feel you there, my girl has NEVER EVER been a good napper, yikes!
If you need to vent PLEASE feel free to email me. I feel like I'm the only one slogging through the day like this, sounds like we have a lot in common! Good luck!