Handhold OP, you have a lot on your plate. Your DH is probably reacting because is a frightened too. It’s scary when someone you love is poorly.
My advice to you, would be to take each day as it comes, don’t think about the future, it’s the now that we have so try, to squeeze the most out of each day. Don’t beat your self up if you have a rubbish day either.
I was dx with MS a few years back, when my DS’s were both young, for the first 6 months, all I could think about is when I would be in a wheelchair, how quickly will the disease progress, my dx came out of the blue, it took me a long time to accept the dx.
My Neurologist, who has been wonderful btw, said to me “you are the same RoseLilly that walked into the room, before I gave you the dx” very sensible advice.
When you receive a dx, you have two choices, let it consumme every waking minute and every area of you life, or think well I have got x and get on with life.
There is always someone worse off, and every day I wake up and can get out of bed and walk, is a bloody good day.
Wishing you all the very best OP.