Tad, I'm very sorry to hear that your mother has taken a turn for the worse. If you ask the hospice folks about support, they have some great people who will be there for you.
Please take care of yourself. I'm keeping you and your family in my thoughts and prayers.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.