We had a brilliant post a few years back from Don and everytime I see someone asking for how to reach their family, I refer them to his words....
http://www.medhelp.org/user_journals/show/5699/MS-challenge-for-life-?personal_page_id=5848
Consider printing this out and leaving it for your husband to chew on for a while.
This is a hard dx for us, and maybe even harder for the men in our lives who are so used to making everything right. They can't with this MonSter and it may be he's going to take extra time to understand that.
The local NMSS chapters often run couples weekend retreats, at virtually no cost to the participants. Keep you eye open for one - I understand they are very beneficial to getting partners on the same page.
good luck,
Lulu