@Busybee91 , just for the record...you are not a nightmare wife! HE is a nightmare husband! I'm betting that your anxiety is wholly down to his behaviour towards you. I apologise, this will be a long post.
Please don't have kids with this guy. He's already shown you the type of man he is. He wouldn't even help you when you were ill on honeymoon FFS. He wouldn't get his arse over to your parents to be on time for a dinner. He has said that he won't change HIS life if you did have children together. He is showing you who he is, and he is not a good man or husband. What on earth makes you think he will be an attentive and good father?
Examples of good men/fathers that I know:
-My friend has a multiple long term chronic conditions. She has two kids, one with profound SEN. Her DH is a hands on parent, and will do whatever is needed in the home to ensure my friend is comfortable and the kids are looked after.
-My brother has two kids. Works FT (as does my SIL). He shares the mental load, the parenting, the housework and if SIL is not well, he will look after her and make sure everything is in order with the kids.
-another couple who I am v good friends with. Married, one child. Both work FT. Like the two above examples, the guy will prioritise the family. He steps up if his wife isn't well.
-my own father. Worked FT (often overseas). Mum was a SAHM. He stepped up when he was at home. He respected her. He never let us forget how important she was. If he wasn't about, due to work, he would pay for any extra help that she needed, so that she wouldn't be run off her feet. He was very old school, but he taught himself to cook/do housework so that it wasn't left to Mum. My parents are now deceased, but this is an example of a couple born in the 30's and 40's sharing the load, to show you it's not just a modern thing.
In these examples, all of these guys have "important, big" FT jobs. Apart from the example of my parents, all of the ladies have FT jobs too. All are parents. All of these guys have hobbies or sports that they play and attend, but not to the detriment of their families. The guys make sure that their wives each get equal time with hobbies/social events. The guys will parent their children, look after the home, prioritise time with their families etc - you know, normal things that normal decent guys/fathers will do. None of them would ever disrespect their wives or families by not bothering to show up on time because of football/their hobbies etc, or leaving their wives/families in the lurch just to please themselves. If either is held up or running late, they let each other know. They will step up if there's illness in the family.
Importantly, the kids see that their Dads are present, and will cook/clean/sort the house/share the mental load. They see that their Dads respect and love their Mums. They have excellent role models. Can you, hands on heart, say that your husband is like these guys? Can you say that if you were to have a child with him, that he would step up like these guys? Can you honestly say that you could rely on him?
Parenting is bloody hard work. You need a partner/spouse/co-parent who you absolutely trust, someone that you know you can depend on. Because if things are shit now (and from what I've read, they really are shit), then that will increase exponentially when you are a parent. My anxiety and stress levels were through the roof in the latter years of my marriage, due to my now XH's behaviour (and he wasn't like that when we got married - an accident and his subsequent alcoholism/drug addiction changed him from the wonderful man I met and married to a complete monster). Once we split and I divorced him, the anxiety/stress went (like @K4tM), despite me now being a FT single parent and working FT.
Honestly, I'd LTB. Get out while you can. Cut your losses and run. Don't fall for the sunken costs fallacy and don't be fretting about what friends/family might say about splitting up so soon after marrying him. He's shown you who he is, take heed. This is your life, and you only have one shot at it. Good luck x