It's probably all of the above. I mean, think about it. You're lying in a hospital bed 24/7 for days on end. You know your own actions put you there. You might be dying, but you have to try to push the facts around in your head because the thought of it all is too much to bear. Nobody seems to know too much about what the future holds for you, and there's not much you can do about ANYTHING as long as you are there.
Think you might get a little cranky, feel a little sorry for yourself, take it out a bit on other people?
I know it's frustrating, but try not to take it personally. He's not able to feel any gratitude right now, though he may very well at some later point.
Big hugs, I know how YOU feel!