Had a long, tearful conversation with Geoff last night about feeling terrible and being stressed, and after writing down a lot of the things I'm worried about or that are stressing me, it seems like almost all of them could be ameliorated by:
A cleaning service
Occasional outside activities for me
Greater housework efficiency
So in the interests of me not dying, I'm going to look into a basic cleaning service and think about the end of cosleeping and night nursing.