I'm sure that life in the private sector is no picnic either, but I can only speak of what I know.
Working in the public sector gets more and more stressful as budgets are slashed, targets are raised and you're made aware in no uncertain terms that your job is to save money, not to help people. I was so relieved to get off my particular treadmill. Facebook this week threw up one of those "memories" from 3 years ago and I was shocked to see that I looked older then than I do now, and so pinched and stressed. Like Luckygirl, I got to the stage where I dreaded walking through the door, as I fear you do, and that's when you have to go.
Please retire, or at the very least do as Ceesnan advises, go to your doctor and get yourself some breathing space, though I think you need a lot more than a couple of weeks. You won't get depressed, you won't fester, life will be different but you'll adapt, you'll feel as if at least one huge weight has been lifted and you'll have time to take care of yourself. You have far too much going on in your life to make yourself ill. 