Husband has CLL and acts as if he hates me

Hello. 

I really need some advice. My husband was diagnosed with CLL last year.  He needed surgery on an unrelated condition but is now starting treatment in the next few weeks which is an infusion and a course of venetoclax. The reason I am in contact is that his behaviour towards me is like a form of torture and it goes on day after day. He has always been something of an introvert and after 40 years I have become used to it and loved him, but now I am at a loss on how to cope. He loses his temper with me over the lease little thing. Sometimes even if I make an innocent comment he orders me to stop talking so I sit for hours in total silence. I think the most upsetting aspect of his behaviour are the looks he gives me which I can only describe as hate filled glares. God help me but all I want to do is run away from my life at the moment. Thank God I have a lovely son and beautiful grand children they are the only thing that makes life worth living.  I probably sound selfish and uncaring but after nearly 2 years if am defeated. My single hope is that my once beloved husband gets through a year of treatment and enters remission so that we can at least try to pick up the pieces.  Sorry for my pathetic rant I am in despair