You will benefit mightily from respite care. When my mother had chemo, both the first and the second time, and we did not know if she would still be with us at the end of it, twice over - one of the things I did by going over to be there for two months was give my dad the chance to go out and play golf with his friends for two mornings a week without worrying what would happen if he wasn't there and my mum needed him. It kept him sane.