If you are helping someone to get through cancer, do not forget to take care of your own health too. It is easy to give someone you love every ounce of energy you have. It is easy to deprive yourself of sleep, nourishment, and vitamins etc.
I know that people don't really think of themselves too much when they are put in a crisis that effects them. If you are, or know someone who is caring for a loved one, give them a friendly hand and take over for them, or let them take over for you(if you are the caregiver). People helping a loved one often run on adrenaline not knowing when they need nutrition, rest etc. It is important that the caregiver stays healthy too.
Give and take help when needed.