Just knowing there is a problem and starting to work on it is a MAJOR breakthrough for you. There are plenty of guys on here that can not convince their wives just how important it really is. We all get the "It's just sex" crap from our wives. So pat yourself on the back, you have overcome the biggest hurdle, to be willing to work on a solution. Just remember to TEAM with your husband to find solutions.
I would also like to say that your husband probably also feels like he has failed. From the view of another HD guy, when our wives no longer desire us, we feel like failures. We wonder, "What did I do wrong?". Am I unattractive? Am I fat? Does she have someone else? Am I a lousy husband and father? Am I boring to her. Unromantic? We kick around about a million thoughts in our heads as to why we are failing our wives. It literally destroys our self esteem.
But your husband is a lucky man to have a wife that WANTS to work with him to solve this issue. With positive results, the two of you can have an incredible marriage!