Melissa, how much out of cage time are you providing your grey? They must be out of it for at least 4 hours or more if you are working from home. He does sound like he wants attention but that does not mean you have to stay there right beside him, take him with you when you go into another room to do something for any length of time. Have several playstands or places where he can perch and see you and when you do have to leave the room for a short bit and he calls you answer him and let him know you are coming back. They are flock animals and they just want some company, you wouldn't want to stay penned up all day in a cage would you.
As far as biting, it does not mean he doesn't love you, they use their beak like we would use our hands and they convey what they don't want with it so a bite happens because he is trying to tell you something.
I see this is your first post, why don't you introduce yourself in the welcome room and tell us some more about you and this grey.