Hi Chrissy... It is emotionally devastating to watch someone you love to pieces deteriorate in body and spirit, knowing all the while you are helpless to change the course of events. I am going through this as well, and I know I do need a lot of " down" time just to absorb the grief of it all. How much does your H know about the emotional turmoil you just went through? Sounds like the two of you just engaged in a control battle about work rather than you having the opportunity to express your intimate feelings and receive support. Is there a way to let your H know more about your inner world? You express yourself beautifully here...are you able to share yourself at home? What would happen?
And remember that although you have no control over your gramma's happiness at this stage of the game, what you can control, and what you are responsible for, is your happiness. She would want that for you. So do the things ( or choose to not do things) that will make you feel good about you.