AQ, I was the same when I found out I was pg with ds2. Elation turns to terror! It will be fine though. Your ds1 will be at school so you'll get a bit of a break in the day. Ds2 will still be having naps I'd imagine so that will also give you a bit of respite in the early days. The jump from 2 to 3 is not as big as 1 to 2, really it's not. Ds1 and ds2 will have each other which makes life easier when you're doing the newborn feedathons, and the whole routine of getting up and out to school, etc means that your day always has some structure.
Washing, etc just requires lots of organisation. I'm a hugely disorganised person by nature but I have a set timetable of what washing/housework I do each day which keeps me on top of things. I also ignore mess until after the dcs are in bed then have a half hour blitz which keeps the place looking reasonable.
Space-wise you'll manage, they don't take up much room when they're tiny so you've got lots of time to sort the kitchen. Knocking through sounds like a good idea - cooking dinner is certainly a lot easier when you're not tripping over small children every time you turn round!
Hope that puts your mind at ease and (((AQ))).
Indith, poor ds. You have my sympathies. Ds2 was a very miserable bunny with his ear infection.
Jabber, hug for you too. Not long til Spring now and a bit of much needed warmth and sun.
FGS, hope you're feeling better. Your DH sounds like a star!
I'm currently sat in a freezing cold house as the boiler conked out this morning and the Home 'Emergency' cover we have through the bank is worse than useless. I've wasted a whole day trying to get an engineer out but apparently there 'isn't one in our area' as we have oil ch . The dcs are tucked up under piles of blankets and I'm about to go to the PILs for a shower!