Sounds like you're in a touch situation, all right. (I should remember this, but what kind of family or other support do you have?)
I know where you're coming from, because exactly 2 years ago, my mom had just died the week before, my dad was having to move to assisted living and getting weaker by the day (turned out he had ALS and died in October) , and I was the one "in charge." My brother is worse off than I, my husband works all the time, and there was no one else. My husband was having vomiting attacks that were pretty scary because we didn't know what was going on there. He had always been the strong one who was never sick, and now I had to manage this, too. Our cat had a couple of mouth surgeries/tooth removals at that time, too. I felt like I was running a very long sprint, which I'm still recovering from.
One day at a time, that's all you can do. Your intentions are good, and I'm sure your husband knows that. We do our best, and then, after a certain point, what happens isn't ultimately determined by us. God, or fate, or the universe, (or whatever you believe in,) has the major power.
Sending healing thoughts,
Diagnosed: Fibromyalgia, possible Meniere's, elevated liver enzymes, skin grafting on back, arthritis, scoliosis, lumbar disc damage, sciatica, IBS, migraine headaches, tachycardia, skin cancer surgeries on face
Meds: Nortriptyline, Clonazepam, Darvocet as needed
Multivitamins, l-lysine, probiotics, magnesium, malic acid, calcium + vit. D, vit. C
Be yourself. Everyone else is already taken.