Sorry to hear about your wife's cancer. Best of luck in fighting it.
The other stuff pales in comparison, but I'm sure every little thing contributes to your stress (and doesn't it always feel like when it rains, it pours - just remember, the sun will shine again).
Keep a positive attitude, and it will make everything easier to cope with (I know it's easier said than done, especially when it feels like everything is going to shit around you), but if you can focus on the things you can actually make the most significant amount of progress/difference on, other things have a way of working themselves out, or at least your mind is less cluttered, and you can devote more of your attention and energy to dealing with the other less important issues.
Good luck...
ADG