All of us, when scared and feeling we are mortal and will die some time (maybe soon) get upset and say silly things, there is nothing personal about it, it is merely a reflection of how fragile your DH is feeling, like an eggshell. 'Don't touch me, I might break' - and like Humpty Dumpty, all the Queen's doctors and all the Queen's nurses won't be able to put me together again.
Personally, if my DH said something like that to me it would have gone over my head and be forgotten by now because I would have understood where it was coming from.
Last week DH was 'advised' by his GP not to drive for the time being, after he had a micro sleep when driving. He is undergoing tests for sleep apnoea. He is feeling much like your DH, RR22, feeling doomed, he will never drive again etc etc. This has lead him to decline in to depression or get over-emotional about everything, (he is a glass half empty person). Not helped by me being hale hearty and in good health. I haven't yet been told that it is all my fault yet, but sooner or later I am sure that will come.