[mikeejimbo]

I would have in fact suggested adapting the Stress/Derangement rules. I might not go so far as to implement Misery, but rather just adapt it so that there isn't an analog of Derangement and the characters only suffer Stress. But Misery is a cool idea too.

Anaraxes is also right that the long-term fatigue rules may be applicable to the physical stress, while the Stress/Misery idea would be applicable to the mental stress. I don't see why you couldn't use both! Some activities would certainly restore some of both.