I'll hazard a guess and say they are requiring proof of medical insurance because of your current health condition and the costs of health care in the US, and the fact that you have joint sponsors. I *have* seen it a few times over the years where someone was denied because the consulate felt that the USC spouse would not be able to bear the burden of health care costs, which are quite hefty to say the least, even with insurance!
If your husband makes enough to cover the affidavit of support requirements, why has he included his family as joint sponsors to begin with? Does he or you have children from previous partnerships? If its just the 2 of you, his anual income only needs to be $18,212. And if you're married already, you should have filed income tax together in the US, which means you would have had to apply for an ITIN, which an insurance company can use in lieu of a SSN. They may not be able to enroll you until you are officially moved to the US, but you should at least be able to get a letter from them to say "yes, we'll add her to her husband's policy as soon as she is resident in the US".
If you have not been able to work since 2006 why not apply for disability in Canada? That way you'll have your own income, even after you move to the US, which will contribute to the household income. That would be taken into consideration, as you should have no break in payments from Canada, you can even have cheques auto-deposited to a US account.
If your husband's income on his own is sufficient to cover the affidavit of support, and the consulate is still waiting on you to respond to updated income information, I suggest you do a completely new I-864 with his updated income information and a letter from his insurance company stating you will be added to the policy as soon as you are resident.


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