Has your husband been diagnosed formally with the proper neuropsychological tests, etc.? Because narcissistic personality disorder only gets worse with age and ventually their scruples. You must prioritize your personal physical and mental wellbeing. This is urgent, mainly for his benefit and of course, yours as well. When you are well you become a better , more empathic caregiver.

I feel for you, I really do. You are dealing with way too much for one person. I hope you can find some respite care, some therapy for yourself, and a break from all this. If you can afford it, hire someone or get a relative to stay with hour husband and take a trip somewhere nice on your own.