Frances ... please stop feeling like you've failed.
What are you going to do about it?
How about doing spectacularly well at all the things you haven't given up? You're not superhuman, but that doesn't mean I'm not proud of you. Don't cry. You're my beautiful, special, brave girl, okay? Just try it this way for a couple of months and see how you go. Then maybe you can step it back up.
It'll be okay. You will get there in the end. Just try walking for a while instead of running, because you were wearing yourself out.