I've been where you are! My first baby was pure bliss, not a moment of sadness or anger, and everything was great. The second time around I had PPD pretty bad, and I think I realized it when 2-3 months had gone by and I was feeling worse, not better.
It's tough to be at the point you are at right now, because the feelings you are having can be totally normal for a mom who is adjusting to having a toddler and a newborn (plus the 8yo!) and you're still only a few weeks postpartum. I think it still has the potential to get better, but definitely watch yourself and if YOU feel worse in the coming weeks, then seek help.
If I were you, I would take FULL advantage of the fact that you can hire help. If you're feeling guilty about someone else taking care of your kids, then hire someone to come in and clean, help with laundry, and cook meals- like a mother's helper- who can also keep your LO entertained while you take a nap. This would allow you to spend the rest of the day focused on the kids and not the house- which for me, is very difficult to balance now with 3 kids. We get so little free time each day when baby is asleep, it's hard to decide if I should clean, make phone calls, take time for ME, or spend it with my older kids.
For me, the two key components to avoiding PPD this time have been SLEEP- DH and my older kids know that I NEED to sleep- a LOT. Sometimes I feel guilty, but I'd rather sleep in a little in the morning and take a nap in the afternoon so that I can be fully present and content when I am with my family. Much better than being a raging b_tch all day because I didn't get any rest!
Also- time for myself is essential. I take a little each day, since the baby is too little for me to leave for a long time yet. If all the kids are asleep and it's just 15 minutes before I go to bed to read a magazine and drink some tea- or take a bubble bath while someone else is watching your kids for a half hour in the evening. A quick trip to Starbucks while I crank up my favorite CD in the car is fun too- it really makes a difference!
I hope you feel more like yourself soon- coming to terms with the new "normal" that happens after each baby is always hard. It only took my until my 3rd baby to lower my expectations of myself and of my baby. My 9only acheivable goals right now are to eat, sleep, shower, and take care of my children the best way that I can. If I leave the house, clean, do laundry, or cook- that's a super productive day!
Jessica- married to David- parenting our 3 monkeys- DS #1 (age 7) DS #2 (age 4) and a brand new DD (born 5/10/10)