Are there any play-groups or drop-in type nursery schools where you could take your child so he could interact with other children? Are there other kids in the neighborhood so he could invite someone over to play with him? Most libraries have a story hour for young kids and that would something fun for him. It's hard in early recovery but he just wants to be a kid. It could be helpful to praise him for good behavior and maybe set up a reward system for him using stars or stickers or something like that. It could encourage the kind of behaviour you want from him.