I think the wife should understand that you have to work extra time to support her and your baby. I doubt she will be happier if you guys went back home and you couldn't find any job there. She will be nagging even more... Let her get busy with something. She has to understand that you dont' have to sit beside her days and nights. She doesn't have to see you 24/7. Some women don't have any husband at all, and no one has died because of that.
I prefer to have a man who is busy doing a business, or probably works extra hours to support me and my child, rather than the one who is lying on the couch entire evening. that would be really bothering me a lot..