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Since it's stress, I don't think it's good for your health.

I started an 'exercise' on my fitbit right before my last onsight started. Fitbit claimed that I burned ~6K calories that day. My 3 week running average is somewhere around 4K.

4K daily average? What do you do, pull sleds all day when you're not working?

Im a recovering chunk monster. Im down 80lbs in 6 months and now I've got pretty decent cardio (6 miles in an hour on the treadmill 5 times a week), but still weigh 250lbs. If you're fat but move a lot you can burn some massive calories, or at least my fitbit says so.

Your cortisol levels rise so that would probably more than counter any small benefit from a higher heart rate.