Mar, I'm really sorry to hear the terrible news. I have a great deal of respect for both of you, taking what is an impossible decision with courage, determination and resolve.
I fully understand your husbands decision. I'm not sure if it is the one I would make, and I pray I won't ever have to find out.
As for what to expect...I don't know. from descriptions I have read, it's a cruel type of cancer in end stage...not that they aren't all cruel. I really think that would be a question best asked of his Doctors.
I see you're in Prince George. that's beautiful country; a relative of mine was the fire chief there for many years until recently. what cancer center are you going to? I assume it's in Vancouver.
I wish I could offer you more in terms of encouragement or answers. Others may well be able to do so; know that there is another Canadian here, thinking about you
Wayne