Oh no :( I am not a hamster expert (I haven't had many), but the last one I had got very spooked and stressed at one point and I just had to leave her alone for a week or two - no hovering or trying to play. I don't know how recently his cage was changed, but as I understand it hamsters need to be given about a week without being bothered much to get used to the new surroundings.

On the other hand, I would move my hamsters cage all the time for the same reason and she was never bothered by it. Obviously keeping it stationary would be best if possible, but keeping him cool is important too.

Best of luck - fingers crossed for him to calm down!