Oh no tying here, I do understand. And I figure if a doctor feels it necassary, it probably is. And if I were in your situation, going peacefully in my sleep may be a blessing. And you will probably do fine on what you're on.
My grandma had MS for 20 yrs. Made peace with the fact it would be what kills her. Suddenly she finds out cancer has been eating her alive for some time. Suddenly she finds out MS won't be the death of her after all. Went through surgeries, therapys, could have squeezed 5 or so years out. But she took her daily ration of her oxy, soma and klonipin. She never woke up.
I am sorry for my bias, I know these meds help. I take them. But certain mixtures, I just can't help putting my $.02
Best of luck&i mean it.