Cat avoids bedroom, now kitchen?

When a friend moved in, we locked him in my room while we unloaded the truck. Since then, he won't come in my room. We figured he just ociated my room with that scary day. Well, now he won't go into the kitchen. That’s where is food bowls have been since we moved in and then all of the sudden, he just won’t go in there. Not even for a Greenie treat! He howled and howled the next morning to be fed. my friend put his food in his bowl and he just wouldn’t come in. If we pick him up and put him back there, he gets really low and would take a few licks while watching over into the corner behind the stove. We thought he might be afraid of the mop that stayed back there so we moved it. No change. I mopped the entire house with it yesterday and he didn’t pay it any attention. We’ve had to move his bowls in the dining room, where he will eat then. He'll stay in the hall and hiss at the pantry. Rest of the behavior is normal. Any idea what is going on in his little cat brain?