So let me glean from your previous posts and diagnose his situation:
He's got a hernia, a bad back with spinal fusion, respiratory/anxiety issues, presumed heart attack, but everything tested ok, suspected hernia distention into the abdomen, but again tested ok. Had some relief with gluten-free. Suspected anxiety disorder. Driving wife and kids to anxiety disorders of their own
I have stomach issues, and diet is key to placating them. My system has gotten to where it rejects every form of man made sugars. The gluten free is important too; the gluten is the tissue between the shell and the seed and it's purpose is to keep molds and bugs from getting to that seed. Refiners grind it up with the seed because, well, it keeps the molds and bugs from getting to that seed. But then you eat it, and now you have nature's anti-fungals and pesticide in your gut. Some guts can take it, mine not so much anymore. It could be the issue with him. Either way, which is the way you really want to eat? So I'd start there, no more candy or cr*p. If he complains and makes you buy it, next time he goes to the doctor quietly take along an apple or some such thing. Then, as he's waiting for the probing and prodding, offer it to him and ask him if he wouldn't like to change his mind.
The anxiety thing, you can't be held hostage to it. You should comfort and support, but if he's going to be a whiny baby you have to sit him in a corner where he can whine it off himself. I realize that's easier said than done with some people, but really beyond comfort and support what more
can you do? If he he keeps playing the 'I'm dying" card, you need to trump that. You need to put an estate plan in front of him, whether to make new or update, and if he blows that off you have the right as a spouse to call a lawyer in for that purpose. You need to put funeral plans and arrangements before him as well. Not in a vindictive way, but as in 'well honey I'm praying for you to be well, but you raise an important subject that we should look at even if we were well...'. Besides actually needing these things in any marriage, having them under his nose might give him a visual on what he is spewing from his lips.
And worst come to worst, you have a right to extricate yourself and your children from an unhealthy/hostile environment. Sometimes the best medicine can be to give someone a look at life without, you know? And you can't help him if you're wrapped tighter than an airport sandwich. It doesn't have to be divorce nor does it have to be separating, it's just getting away to take a breath and help save everyone's sanity. "in sickness and in health" includes
your health too. And your children's.
God bless you. I'll be praying for you all. Amen!