That's very noble of you @Seawolves , and I'm sorry to hear about what happened. But there is no guarantee that your husband would have done the same for you. It's a well documented fact that when a man becomes ill and infirm and struggles to look after himself, his wife steps up and looks after him, even if the marriage is not the best and she doesn't love him as much as she used to. The men however, are far more likely to walk away. Whether the marriage is good or average or not so good.
Men are inherently selfish and self serving, and often do very little through a marriage, and much is left to the woman - domestic chores/life admin/childcare etc, because they are so busy with their 'big important job' and their man hobbies, so they're not very likely to drop everything in their life to be a carer for their wife indefinitely.
@Bigdolly76 OP, you are perfectly entitled to feel this way, and I'd be surprised if you didn't! It's also understandable to feel like you want to walk away and leave him. You don't know how long this is going to last for, you're still only in your mid 40s, and you could potentially have another 40 years of this. I think at that age, many people - even some women - would be questioning whether they would want to stay.
Is there no sign of an end to it? Like has the doctor said he may start to return to normal within a year? Two years?