I think my puppy is stressed out. What can I do to make him feel better?

My husband and I are moving out of our little apartment and into our new home at the end of the month. We have been slowly packing up for the last couple of weeks and boxes are slowly beginning to fill up the floor and counter and well, just filling up everything! The place is basically in shambles as we attempt to get things sorted and organized. I think it is really bothering my 4 lb. toy poodle. He is generally scared of things that are bigger than him (in other words, everything) but lately he has started to just bark continuosly at the stacks of boxes or sit behind a chair and hide as we pull out packing materials. He seems very unsettled. Any tips on what I can do to make him feel better? I am worried he thinks we are going to leave him behind, poor baby, and I don't know how to communicate to him that everything is all right, he is going with us and will love all the extra space (plus his own yard) to run around in.