My heartfelt sympathy. So much good advice already given here, but I would like to add next time a friend comes out with some platitude about how well your husband looks, when he is not within earshot, sit the good lady or gentleman down and explain that you need a friend you can honestly discuss things with and you would like it to be her/him.
It is nice that your husband is stable right now, but he is suffering from an incurable disease. However well he is now, the long time prognosis is not good, unfortunately. You need someone who will listen to you when you need to express your anxiety about the future. Someone who will not tell you that everything in the garden is lovely.
You will unfortunately not stop worrying about how much your husband will go through before he gets to the end. I am not saying he will suffer, hopefully everything will be easy, but you will worry.
You will also worry about how your life will continue when the sad day that finds you alone comes.
If your husband is in denial you cannot discuss matters with him, but please, do check with your bank whether joint accounts are frozen on the death of a spouse - where I live they are, although funeral expenses can be paid from them by the bank.
This may seem cold, it isn't meant so, you need to know how you will be placed, you will be less able to deal with financial issues over and above the emotional side of things later on, if for no other reason than because you will be tired.
I speak from experience, my father knew my mother's and his joint will was out of date, my sister had had a son after that will was drawn up, but my mother was in denial and there was nothing my father could do. As she had always dealt with all financial matters he was lost. I would hate the think something similar would happen to anyone else.
Once you have one person who will allow you to be honest, try to get your adult children to accept that death comes to us all and that their father's time is approaching. If some of them genuinely do not realise this, the shock will be all the greater when they are forced to face the reality.
Keep us posted. We all feel for you. And forgive me, if this comes over as being cynical, it is not meant to be.