Welcome to NT, FarmerJane.
So sorry for what you and your husband & son are going through right now. I don't blame you for not having the energy to get up in the mornings--sounds like your husband must depend on you for everything.
I don't have any sage advice, not having been through anything like that myself (other than taking care of Dad in his final weeks of life). I will remember you in my prayers and hope you find some comfort. Is there someone who can give you some help or a break?