Potty1 - I've started a new thread rather than hijack the roll call one. I'm sorry to hear about your daughter.
My son does get depressed when he's very tired. This seems pretty natural to me. It must be very frustrating for children and teenagers not to be able to attend school and be with their friends - he has been out with friends only about twice in the past four years.
I do find it hard to cheer him up. How do you help your daughter when she feels like this? Does anyone else find that their children, particularly the teenagers, become frustrated with their illness/condition?