One of last years Nobel winners in Medicine, Dr. Blackburn presented on a study of caregivers, caring for their very sick loved ones. Each week, her team asked them what their stress levels were on a scale of 1 to 10. The higher their stress level as subjectively reported, the fewer T-Cells were present in their blood, and, the less active those T-Cells were. They also measured the telomerase levels and found that stress shuts down telomerase levels and is responsible for the T-Cells dying early and being lethargic and lazy, not doing their job. Cancer cells already have telomerase turned on, but stress shuts it down with regard to your T-Cells. Meditation will turn it back on.
My advice is to spread the job of caregiving around if possible, but to spend serious time in meditation or prayer every day, probably 40 minutes to an hour. Meditation courses are available, and various meditation techniques can cause the production of huge amounts of endorphins and actually make you feel good, think more clearly, rest at night, etc. This is good for both cancer patients and caregivers, as it boosts the immune system. You owe it to yourselves and your patient. I strongly suggest an instructor to guide you in meditation till you become proficient,,which you can do in a few hour course.
God bless you all. I assure you that meditation can grant you peace and even happiness in your battle , and give you an immune system that will help fight the cancer.