I had to learn the hard way that just b/c i felt good one day didn't mean i could go from 1 hr of activity (and by activity i mean visiting with friends, running errands, walking, computer, etc) to 6hrs of activity. after several setbacks i finally made myself stick to a schedule of 2-3hrs of activity a day, then have sorta reverse tapered it as i feel stronger. it means i have fewer "mountain" days where i think "i'm healed!" but also fewer utterly despairing days during setbacks.