The way I have learned to cope with it is to stop worrying about the things that aren't truly important. So long as I can feed my family I'm happy. I stopped caring about the job; I work hard, put in my time, and generally learned to say "no, I don't have time to get that done until <whenever I can actually get it done>" - so far, my job has adjusted to me, and I don't really care if I lose it. I found that so long as I keep my spirits up, my wife will follow suit, which makes it substantially easier to keep my spirits up. I stopped worrying about money: food gets first budget, and I have the luxury of having one vehicle free and clear. If I don't have the money, those who can take something away quickly (gas/electric/phone/daycare) get paid before those who can take away with difficulty (mortgage) get paid before those who can't take away anything (medical bills, CCs).
The biggest problems for my family have been medical (wife had three surgeries last year followed by depression, daughter born last year had many health anomalies) which led to financial problems (income only met basic expenses for 5 out of the last 16 months, all CCs now maxed). A large part of my peace of mind is a complete lack of attachment to any material possession I have - I can emotionally afford to lose it all. It doesn't hurt that my family is now in substantially improved medical condition...
I've also learned to deal with the fact that I will only get about six hours of sleep out of every 24, and usually broken into 2 - 3 hour chunks.
I don't know if any of this applies to your position, but it has definitely helped in mine. I guess the basic tenet is "No one has any power over a man willing to lose everything."
Oh, and watch Requiem for a Dream, your problems will most likely pale in comparison...
