Was he drinking through out the marriage and before it? If so then maybe this IS who he really is. The alcohol was covering up things that you are just now learning about him.
Also he is fairly new to sobriety and from what I understand, it is still a bumpy road until they figure out how to balance day to day life (including stress). Sounds like the writing (like the drinking) is a replacement for the escape drinking gave him. An obsession is an obsession.
Have you thought about marriage counseling? One year isn't that long to be feeling so hopeless
Wish I had more constructive feedback but recovery is very complex and affects everyone differently. Hopefully his behavior is part of that growing process and he will eventually 'even out' and participate more in the relationship.