i agree with what neoma said about worrying about taking baby steps and concentrating on today, rather than tomorrow.
i'm type II bipolar, fun with rapid cycles and mixed episodes. small things can just blow my day completely to hell sometimes. i know the overwhelming-ness (i am saying that's a word) of looking around the house and not knowing where the hell to start and not wanting to do any of it at all.
what helps me with that is basically a carrot and stick approach. if i do one bigger chore or a couple small ones - cleaning the clutter of the coffee table, tending the dishwasher and the dishes that need hand washed, a load of laundry, whatever -- i allow myself an equal amount of time, give or take, to do what i want to. wash, rinse, repeat. it does take a bit longer to get things done, but they're getting done. also don't try to do everything at once, do a bit each day.
another thing that helps me is planning. i'm not a fan of lists, but it always help me to run through what needs done out loud. if i can get everything that needs done straight in my head, then it feels much more manageable. i'm not much of a type a personality, but i can plan like a mofo.
the added factor of dealing with a spouse who is unwell makes it that much harder to deal with what you're going through, i know. my husband went through a nearly year long, very deep depression. all i could do most days was haul myself out of bed and go to work because i had no other choice. the house was a disaster, it was all i could do to make sure the cats got taken care of.
i've been on lamictal and trileptal for about 2 1/2 months now and they seem to be helping. a lot more stuff rolls off my back and even some big shit doesn't faze me now.
good luck to you