Seriously, adjusting from one to two is tough. But it DOES get better and easier over time, really.
Part of it is hormones and lack of sleep for mama (and having gone through birth)--it's just the PP period.
Part of it is adjusting to being out numbered. And it's an adjustment for the kids, too. This is my fourth and my 3 yr old was rockin our world out of alignment last week, lol. But she's getting better this week.
Go easy on yourselves and your kiddos and spouse. It's a transition and like all transitions, takes some time to get used to the new normal.
It has typically taken me 3 mos for all these interplaying pieces to come into place. Once I figured that out I was able to relax and just (mostly--we all have our moments) take it as it comes.
My big priorities are mealtimes. Eating regularly keeps us all on a more even keel. I make dinner in the morning because babies tend to need more in the pm and everyone is tired and starving! Crockpots are your friend!
Having children is a blessing! Anything worth doing/having takes a lot of effort, but IMO makes the blessings that much more enjoyable!
And like a pp said, it is wonderful to sit in the rocker and watch my 3 children all playing together! (You should see the messes they are making building forts!)