I am still (very unhappily) married, but I say bollocks to the marriage vows.
That's not being cynical, nothing wrong with commitment and monogamy, but after a lot of wrestling with the fact of my own situation I have come to the conclusion that marriage is only truly meaningful if you are religious and think you have been 'joined by God' etc. And even vicars throw in the towel if it gets too unbearable! I hate having a contract that binds me to someone now, wish I'd never got married, only did it to please my mother.
It's important to remember that marriage, historically, was a way to share wealth between families (still is in much of the world), also to ensure that children were provided for. Before contraception women would bang out a child every year. This made them powerless, and marriage helped MEN to ensure their daughters were looked after.
I'm not trying to give a history lesson. But the stigma attached to marriage break ups is a hangover from history. It is no longer relevant. The fact that society is different and people don't have to stay living in misery is something to be celebrated, not lamented. More people think now that children are better being raised by happy, separated parents than unhappy married ones. All the Daily Mail statistics etc about children suffering when parents split is usually to do with money, reduced financial circumstances than anything else.
Some people might think you are selfish if you left a disabled man; I don't. It's not selfish to want happiness, or live your life for yourself rather than everyone, or anyone else. It's your precious one and only life, you owe it to yourself to live it for you. A lot of people are sanctimonious about marriage breakdown because they are stuck in unhappy ones and can't or won't leave. They take the moral high ground because it makes them feel better about their own lives and choices. Equally, if they've never known what it's like to be unhappily married they don't understand what torture it is, so aren't qualified to judge those who do.
Long and the short of it is I say forget the contract and focus on whether you want to stay with this man, can you make it work, can it satisfy you, do you feel like this because you still need to come to terms with what has happened. I can't help feeling if you truly loved your husband you would want to care for him, but you may just be worn out and need a break. I think you are right to sit tight and hold fire until you have clarified the answers to these questions.
Is there any chance you could negotiate some freedom/open marriage with your husband? Few people can make this work but some do.
I'm also curious like nomedoit as to whether the fact that your husband was drunk when he had his accident is something that you resent him for, although you say it was 'not his fault'.
Oops, didn't mean post to be so long, get carried away with typing.