K.,
First of all, it sounds like you were doing an incredible job! Any transition is rough, but you'll find a rhythm again soon.
I agree with the mamas about lists...or make yourself a job chart. Is your little one walking around? This is a great time to learn about "cleaning up" and "helping" in little, fun ways so he is accustomed to helping out more when he's older.
I HATE doing dishes,but can't deny that it's nice when the kitchen is clean. When it isn't, I feel like I'm behind before I even start the day. Not good, so this is one I really try to do (although if there are some dishes in the sink and my body is telling me i need to SLEEP, well then, zzzzzzzzz!)
If your son naps on the weekends, I would take that opportunity to blitz the house: dust / vacuum / straighten.
Try to keep clutter at bay. We're still working on this one. Don't allow mail to pile up. If there is junk mail, get rid of it right away and maybe get (or make) yourself a "to do" bin for pressing things. When your son goes to bed, flip through it and try to take care of the things that are most immediate.
Whittle away at the housework: maybe only one load of laundry a night or save it till the weekend? I blitz the bathroom when my son is in the tub so I'm right there (it's small), I can do it fast, and still be with him.
If I have a lot of straightening or laundry to fold, I would set him up in my room with me and put a gate across the door. He would be fine playing on the floor (or on my bed - lots of pillows = laughs!) while I put music on a worked. Again, together time! I would make it more interactive by talking to him about what you're doing, stop for kisses and reassuring hugs and maybe a dance break or two. =)
Try as best as you can to get to bed at a decent hour. I'm a total night owl, but I pay dearly for it sometimes. Give yourself a fighting chance by resting up and protecting yourself from sickness, fatigue and even depression.
Get a calendar or planner. Write everything down!
Little by little, things will come together. You're doing great! Don't forget to forgive yourself if things slip here and there. Loving and providing for your son is the priority...everything else can be a bit flexible.
Good luck!