Stormy I'd not argue with that perspective. There is a reason why married men are happier than single men, and married women more depressed than single, and I'd say it has an awful lot to do with the sheer drudgery of being the one who is expected to bear responsibility for literally everything at home.
I was f-ing depressed when I first got married. Couldn't believe that the supposedly caring, responsible man I married wouldn't so much as lift a finger at home unless I nagged him for 3 days, and then it became me being unreasonable and him feeling martyred for being nagged. It still grates on me to this day.
We've reached an equilibrium, he earns, I do almost everything at home but have walked away from gardening duties, and he has to spend time with the Toddle, change her nappy, and generally parent, although not cook for her or wash her clothes.
When he gives up work for good this equilibrium will have to change or by default he'll end up living his life like he is in a hotel, and I'll be staff.
It makes me wish I had a boy so I could instil some sense of domestic responsibility in him from an early age and make sure any future DIL had a happier marriage than so many women today.
Oh, and that's before we even start on discrimination outside the home! Perhaps I should join the feminist board. Although on second thoughts perhaps not, given I am a SAHM who gave up a career, that had required years of study and hard graft, without any thought, for a man!!!
Plonky I'm kind of relieved to know the nappy situation has a logical explanation.... although I may be varying her breakfast a little more from now on 
Those of you feeling down, I'm thinking of you. I've been there, it's hard, but the best way to manage things, and the way that worked for me is to take control of things. It's that spiralling feeling of my life being completely out of control that takes me down. I find breaking things down, to identify what it is I'm not dealing with, and then trying to find some way of managing each thing on the list really helps. It's a step in the right direction anyway, although obviously some things on the list aren't immediately fixable.