Thank you for your response. I feel much better today. I completely agree that the worrying is worse than the illnesses in 99% of cases.

Thanks for saying I'm a good friend. But I don't feel like or view myself as a hero or anything. If this was hard for me, then I might feel exceptional. But realistically, this is an area that I'm good at; I don't mind taking care of others if they need help; bringing her to chemo doesn't trigger anxiety or depression in and of itself; it doesn't really take much effort to do what I'm doing, and she really benefits from it, which makes me feel good.

Thanks for your time and your support.
Mary