Wow, honey! I just want to give you a big hug, bring over a casserole and help you get the laundry folded and the house cleaned up!
And then give your husband a good talking-to!
I think that a lot of people, men especially, deal with worry in strange ways. They want to pretend like there is nothing to be concerned about and then nothing bad can happen, right? That may have something to do with your husband's not wanting to acknowledge that you need help.
But- since you say he has ALWAYS been sort of like this, I hate to say it, but maybe he's just lazy! If you having a serious illness isn't enough to get him to step up and help out around the house, I am not sure what would be!
How does your son feel about all this? I am not saying to put him in the middle, but at 15 he sees everything and must have an opinion about it. IS he helping around the house and doing his share? If you're sick, he needs to step up too and help you out some more.
You say that you and your husband are involved in a great church- it sounds to me like if you are determained to stay with your husband, at least until your son is grown, you and he need to go to counseling RIGHT NOW. With your pastor, or maybe a health professional, (your pastor or doctor can recommend one). Possibly some family sessions with your son, who must be worried and frustrated and not know what to do, would also help.
A double- barrelled approach might be most helpful- going to meet regularly in private with the pastor, just the three of you, to discuss the spiritual aspects of health and love and respect in a marriage=and then also meeting with a marriage counselor or healthcare professional WITH your husband, who can help get him to understand that your body is under tremendous stress right now and he is making it worse and more difficult for you to get better.
It is not ok for you to sacrifice your health to your husband's laziness.
It is not ok for him to disrespect you, the home that you share, or your condition.
If he isn't afraid of you leaving him, he needs to understand the poor example he is setting for his son and maybe the pastor can put the fear of God in him as well?? Something MUST motivate him, right?
I wish you well- take care of yourself and know that you are doing the best you can. Remember that prayer is a wonderful thing- but God likes it when we put forth some effort ourselves too!! Get your husband to go talk to your pastor and your doctor for a start. Good luck and God Bless!!!