Blue Rose offered very sound suggestions and websites. Get involved so you can heal from this.
To address your concerns at the end of your post:
* If he can change and pull his life together, that's great, but you are not responsible for his happiness, success, sobriety, or anger issues
* He does not feel the same way about you that you do for him, and he likely never will because, at this moment, he is incapable of caring for anything other than feeding his addictions - you and your children are not only secondary, but you're all in the way of what he wants to do
* You don't want to be alone? Sometimes we must be alone so that we can learn about who we were meant to be. Being "alone" doesn't have to be a punishment - it can be a time of discovery and liberation
The order of NO CONTACT is probably the kindest and wisest Order that could have been rendered. In order for you to get your head out of his addictions and into caring for yourself and your children, No Contact is the only way to get that started and keep it going.
Finally, ask yourself this series of questions: Do you want your children to grow up and choose people who will harm them the way that you've been harmed? What is it that you truly "love" about your husband? Do you "love" his honesty, truthfulness, dependability, unconditional love, support, encouragement, etc? Of course you don't - he doesn't provide any of these things to you or, more importantly, your children. What do you think that your children are learning by watching this disastrous relationship? Are your children learning how to engage in a healthy, loving relationship, or are they learning how to become victims?
Having emerged from a horrific marital situation, myself, I will offer you this with the deepest love and sincerity: IT WILL NEVER GET BETTER and you are responsible only for your own success and happiness, and that of your children. Redeeming your own soul and helping your children to heal from their traumas should be your first priority. Period.
One more website for you to check out, and I strongly recommend this to you: http://www.lovefraud.com
Brightest blessings to you on your healing path.