Postpartum Depression?

I'm not sure that I'm necessarily at that point. I think much of what I'm feeling lately has a lot to do with the weight of issues I'm surrounded by lately. With the health of my mother and grandmother in question, adjusting to life with two children, not sleeping through the night, and just trying to catch up on things like housework, I feel spent. I just want to hold my little girls all day, and do nothing else. I want to worry about nothing else but them. As nice as that sounds, it would be to the detriment of everything else around me. I want to wrap myself in just caring for them and NOTHING else. I don't want to clean, I want to play with my two year old. I don't want to get dressed. I want to sit and cuddle with my newborn, while taking in every detail of her sweet little face. There are days when I feel like it's time for me to take life by the horns again, but with the recent events in my life, (I suppose it's more of the events in the lives of my mother and grandmother) I feel overwhelmed with emotion and responsibility. Today I forced myself to do some house work, and I made a mediocre dinner (that wasn't ready until late). All the while, I'm feeling inadequate as a mother, daughter/granddaughter, and housewife. I'm desperate to 'catch up', and finally get on top of things I've been neglecting, but then that feeling of just wanting to lounge with my children creeps in. Maybe I'm just feeling lazy? Is that what it is? Maybe it isn't any sort of depression, or feeling overwhelmed. Maybe I'm just plain lazy, and looking for excuses to not have to do anything around the house or venture away from it. I did make myself go out yesterday. (It took me 5 hours to pull everything together and actually get where I was planning to go). I went to my mother's so she could spend time with her grandchildren, and I made dinner for the family. Part of me felt that if I were there helping, I wouldn't have to worry so much. Another part of me felt it was a great excuse for not getting anything productive done at home. Was that selfish of me? Going to help my mother simply so I wouldn't have to be accountable for the dishes not being washed? Or not having anything thawed out for dinner at my own home? I just can't shake this overall 'blah' feeling. Sometimes I tell myself that I'll feel better and shake this once I've slept for more than two or three hours in a stretch. I know that staying home doesn't really help the way I feel, but how do you shake it well enough to WANT to leave the house? My husband has tomorrow off, and I'll probably use that time to maybe get some extra stuff done. Perhaps run some errands on my own, without the girls. Just to be alone for longer than a trip to the bathroom or a shower. I sincerely hope that when tomorrow comes, I don't instead stay in bed all day saying 'I need to sleep' as an excuse. Doing so would only cause me to miss out on some wonderful thing we could be doing together as a family and creating memories for my daughters to carry with them forever. I'm hoping my husband will decide that I need to get out of the house and take us somewhere. Or even just send me somewhere. This way I won't have to dig down and find some reserve of strength and make myself do it. OR maybe it would be BEST if I actually did dip into that well of mommy strength, and just quit feeling this blah feeling. I mean, it truly isn't fair for anyone around me to have to be brought down with me. Is it?