I am crying will reading your post. I am so sorry to hear. You and your family will stay in my thoughts and prayers.
Caring for a loved one is the most rewarding 'workout' but please remember to listen to your body while you are helping your mother and try to take some time to also care for yourself. I can’t tell you how, wish I could. I can only speak from the experience of one didn’t and tell you please try.
Sending you strength
Carrie