Hi! I adopted my Porter last summer and I had similiar experiences. It took Porter almost 2 months to settle down and get used to my schedule. Your new puppy might just need sometime to get used to you and the new place. Porter used to follow me from room to room because he was worried to get left behind and he had severe separation anxiety everytime I leave, but it got a lot better as he realized that I'll always come back. I live in an apartment also, all the noise from the separation anxiety was bugging some of my neighbors. I knocked on everyone's door and apologized and told them I am working on it and they were very understanding.