oh hun, that doesn't sound awful in any way, please don't think that.
If you've got things on your mind, which you have, course you'll be knackered.. Its not totally the same but I can't can't switch off when I'm worried about things and it makes it hard to rest properly.
You are a fab mum, never think otherwise! If FOB doesn't bother, He'll have to face her when she is old enough and realises what he is like.
She'll know whos been there all the time and she'll thank you hun.
xxxx