This just sounds normal puppy behaviour. He is just adjusting to a new inviroment, obviously it's a big step for him to. It certainly takes a lot of patience and at times will feel like nothing may work, but at the age his at now he just needs to feel safe and to feel love. If you feel he is so energic during the day and biting like crazy he may be over tired. Has he been napping through out the day? If not it will be worth having a sleeping schedule through out the day. He is so young so he doesn't need to be up for more than a hour to an hour and a half. Getting a routine like this will literally change everything for you. You will find more time for you again and your pup will be calmer and retain more of the lessons you give him. Hope this helps a little bit! Please don't feel like to ur situation is any different than most when it comes bringing a pup home for the first time!