Copa, you hit the nail on the head.
Thanks for putting what I was thinking into words. I was thinking he needs to continue to do what he's doing now while we are there (working, going to meetings, making adult choices to take care of what he needs to take care of, etc.) and we are just coming to visit and spend the day. Just doesn't feel good to spend the night period!
I know he doesn't want to be "like this", he's said it. I try to explain that his addiction is stronger than him and any of us. I do know he has anxiety and depression and sometimes I think a touch of Aspergers but he denies the latter. I told him it doesn't mean he can do anything about it anyway, but be aware of it. He was 100% normal until puberty so he probably doesn't have it but although he has an above average IQ I think there is something else going on - another program running in the background that keeps him down.