Sweetheart, your intentions are noble and you're being very brave and self-sacrificing. May I point out that your work is also not achieving one of your most important short-term goals, which is to help all of your family, including you and DH, to stay happy and healthy.
Money isn't everything, especially when you don't need more. Future security is not looking so great either, if HD is not participating equally. It sounds like you're setting up a bit of a co-dependent situation, taking up the increasing slack as your husband is playing out more loose rope. You're not getting to where you want to be this way.
And by the way, bash, bash, bash! And bash, bashity, boom, bash! There. I'll bet you survived that just fine. Please take all advice we give you just as lightly. They are just words. We tend to feel bashed when advice hits too close to the truth. So if you feel that way, I hope you'll notice your reaction, look for the truth of the situation, and correct accordingly.
By the way, I was diagnosed with Type 2 Diabetes almost 10 years ago, when I was 55. For me, it wasn't a sentence of future disability, and I started putting my health first so I could manage my future. I'll probably end up on insulin soon, but that should actually make my life easier, according to many people who have practiced extreme willpower for years. It sounds like your husband could use some help dealing with shock and discouragement. If his insurance will cover counseling or classes in managing diabetes, it would serve him, and the family that counts on him, well to take advantage of that.
My very best to you and your family.