Upset and worried

Everyday looking at my mother in pain amd vomiting etc, I feel sad and terrible. I don't understand why this kind of illness must fall on her. She is still so young and now she got to go through so much discomfort. Why can't it be me? If I am the one in pain, I think I will feel better compared to seeing her at pain. I am worried. Will she attempt suicide if she cannot take the discomfort. Will she die soon. All this make me scared. I cannot imagine not having her by my side. I am so dependent on her. .