Why is my dog doing this he looks stressed

Why is my dog acting like this

We just moved into an older home and my dog never seems to feel comfortable in here he whines a lot. and when I go by the door he tries to run for it, I catch him looking really alert and staring towards the kitchen like I just tried to distract him but he looked like he was keeping his eyes on something that’s not there. We went in the room and he is still whining staring at me than he looks up really fast ears pointed looking straight ahead. He has his food and water and I let him out for like an hour. He was hard to bring back inside and continue to whine he’s a 6month old German shepherd he doesn’t ask like this anywhere else