I don't remember the feeling as physically battered after DD1, but I had been pretty ill before I had her and the whole birth/ week after is a bit of a blur still. I do remember feeling like I had been kicked in the stomach by a carthorse after DS though, I could barely roll over in bed the second night as my stomach muscles were so sore - I asked a MW on the postnatal ward who said it was afterpains but when I saw the MW who delivered DS on a postnatal visit the week after she said it was just sore muscles from the effort.
I felt pretty sore and achy days 3-5, but that is mostly gone now - I definitely feel it when I'm on my feet a lot and notice a big increase in bleeding - I properly lazed around this morning and had nothing for a few hours.
Other than that, things are going pretty well here. I'm FF because of meds (I wish I didn't feel the need to always add the reason, you'd have thought I'd have got over it after 3 DC) so DH and I are splitting the night feeds at the moment, and to be honest DD2 is still sleeping a lot so it's not been too bad so far, she generally feeds about 10:30 and 2:30 at the moment, but by previous experience that will change!
I'm dreading DH going back to work as well though, I have no idea how I'm going to get us all up, out of the house and get DD1 to school and DS to preschool. The first week DH is back is half term though, which is a bit of a relief as at least we don't have to be anywhere.