I moved recently and my weight also shot up 5+ lbs, and I didn't actually do very much heavy lifting. (We hired ex-Marines for that!) The unusual activity and eating patterns, new/different movements, even altered sleep schedule - all wonked me good. It lasted about a week (but so did all the craziness), then took 2 or 3 days to fall off. None of it was a gain -- just my poor body wondering what the heck was going on and trying to cope with all the insanity!
Drink extra water, try to get all the sleep you need, and wait it out. Also, enjoy the new place.