You Are Not A Bad Person

NEVER NEVER EVER THINK YOU ARE A TERRIBLE PERSON. The hardest thing in the world is to be a caregiver 24/7.
Just tell your husband that you cannot do it and you are going to get some relief. He may not appreciate it now, and most likely will try to manipulate you to feel guilty, but that is now. He and you are under a huge amout of stress. It sounds like he is dealing with by wanting you to be there, (maybe he sees you as his rock, stability, his port in this storm)
When he and you are mot under so much stress he will be able to see that you cannot he there all the time.

Ask at the hospital if there is a social worker attached. She/He will be able to direct you to a suppor system. ie: relief help

If you are a member of a church call them for support!

Remember, things are said when you are in a stressfull situation that would not be said normally.

Your husband may be more comfortable with a stranger helping him than having someone he knows.

Again:
UNLESS YOU PUT ITCHING POWDER IN THE URINAL; YOU ARE NOT A BAD PERSON