Everytime I moved with my cats they would always freak out with their new surroundings. They would go into hiding and I would allow it just letting them come out on their own.
Of course if he isn't eating, still, that is something to be concerned about, but I would think when he gets hungry, he will eat! Is he using his litter box? And I agree, take him to the vet if it doesn't improve soon. With the Thanksgiving holidays coming up it may be a good idea to go sooner than later, especially if you are going to have extra guests in your home.
The last thing, I wouldn't force him to do anything he isn't ready to do. I am assuming that he jumped on you w/o notice and perhaps he was just as startled as you w/ it all. New owner, new surroundings, etc. You know one thing about cats, you don't own them, they own you!! LOL!