TheSeriousSanta,
in a way this is too big to give really good advice on i think
but , in case they help, these are my initial thoughts...
you made me laugh about not leaving the baby with him for a day - because i've often thought what you say myself!! You hear of women leaving the baby with their dh while they have a day out, and coming back to find chaos...and a reformed dh...but i just don't get that.
looking after a baby for a day bares no resemblance to looking after a house and baby (or several dcs), and a dog, and doing the washing, ironing and putting away, buying groceries, cooking, vacuuming, paying the bills, cleaning the bathrooms, washing the kitchen floor, cleaning the oven, making sure there is nothing mouldy lurking at the back of the fridge, cutting the grass, going to the bottle bank, emptying the bin, remembering to brush your hair...and trying to look attractive and jolly at the end of the day, for a week or month or years and years!
i think if you love him, there is no reason why you should leave him. you have simply fallen into very traditional roles, and this isn't unusual (even in nearly 2009!). In fact, it suits a lot of families very well indeed, so is nothing to be ashamed of or alarmed about.
but at the moment, it isn't suiting you. partly because you are just plain exhausted - and you won't be so exhausted forever, so you will overcome that aspect of it.
but partly it sounds as if he isn't entirely happy with the situation either. i would guess that he hasn't totally got used to the change in roles since the dc came along. he perhaps feels left out, particularly as he isn't there all week while it is just you and the baby. and maybe he feels like you are always looking after the baby, rather than looking after him. you know, he isn't your first and only priority any more, and you don't keep his home quite as nice as you used to...?
i would guess you both still have a lot of adjusting to do, and it can take time. especially when you don't have seven days a week because it is all crushed into two at the weekends.
and then, you probably think every thursday/friday something along the lines of, "i'll make a nice meal, and it'll be lovely when he gets home, we'll play happy families, have a meaningful chat, actually enjoy each other this weekend"...then he gets in shattered, asks grumpily what's for tea, trips over the ironing, says a few choice words and a row breaks out. and it's just another anticlimax, and you both wish he'd stayed away!
or maybe i'm projecting
i think my point is, you aren't alone, but that won't make it any easier.
you do have the rough end of the deal here
but your dh probably thinks he has the rough end of the deal - he feels like he goes out at the crack of dawn on a monday, works hard all week away from his dw and dc, gets home late on a friday expecting fireworks and champagne and a stepford wife ready to provide whatever sexual pleasures he fancies (with a smile on her face)...and he gets a house that doesn't look like an expensive hotel with a little fold in the end of the loo roll (actually i have a friend who actually does that!!), and a wife who maybe has a little sick over her shoulder, and who stays home all day and still hasn't ironed his shirts ready for him to take on Monday morning!!
so he feels the anticlimax at exactly the same point you do, but he's a man, so he doesn't try to disguise it - he just gets grumpy and it's all downhill (again) from there.
i know that doesn't really help - i just wanted you to know that people understand or misunderstand possibly...
really i just mean, don't even think about leaving if that isn't what you want...give it time...time for you both to get used to your new lives