It is very hard to deal with a narcissist. Narcissism is a personality disorder which is a category of disorders that are difficult to treat with therapy, even if the person wants help like your husband. Everything about a narcissist is "me first". They lack empathy and only want to be involved in something that benefits them in some way. They do not hesitate to say or do hurtful things to someone else. When told about their behavior, they often find ways to make it the other persons fault or they just ignore the information. And as your husband has shown, he needs your focused attention and responses the way he wants them and not the way you can provide them. This puts a burden on you to be what he wants and not to get what you need. And the fact that he was so hurt in his past can make it hard to cope with his need to control you because you want to help but you also want what you need from him.
There are two ways you can address your husband. One way is to lower your expectations. Keep in mind that correcting his behavior or even just asking him to act in a certain way might cause him to react in a hostile way or another strong emotional reaction. You can react by praising him in such a way that you do get the response you want. For example, if you want him to do a certain task, tell him that you admire the way he does it. Appealing to a narcissists ego usually works. And you can also set limits with him. Complying only partly may not make him happy, but a simple response of "that is all I can do right now" might help.
Try to keep your emotions out of your dealings with him. Narcissists often provoke emotional reacts in others because their behavior is so offensive and hurtful. Training yourself to not react and to remain neutral can help. Develop a few non emotional responses you can provide to just about anything he says to you, especially when he tries to provoke you. "I'm sorry you feel that way. I am here for you but that is all I can do right now." is a good response to just about any comment. It leaves your feelings out of it, negates a reaction and keeps him from feeling offended.
Although you are in therapy (a very good step to take) and are working on how to cope with your husband's behavior, you can also learn more about narcissism through self help to help you find more ways to cope with your husband. Here are some resources that will help: http://www.ehow.com/how_2113015_deal-narcissist-life.html
The Wizard of Oz and Other Narcissists: Coping with the One-Way Relationship in Work, Love, and Family by Eleanor D. Payson
Disarming the Narcissist: Surviving and Thriving with the Self-Absorbed by Wendy T. Behary
The Object of My Affection Is in My Reflection: Coping with Narcissists by Rokelle Lerner
You can find these books on Amazon.com or your local library may have them for you.
I hope this has helped you,