Don't underestimate the importance of "me time".
I find I start getting cranky when I need time out and when I do I'm a whole lot better. More fun and patient.
Some days i just think stuff the housework and I'll just do what really needs to be done and thats it. When DD is having her nap i make sure I take some time to sit down eat something watch TV put my feet up.
If you can afford to put your DD creche for a day I'd say go for it. I think it will be good for you.