Thanks for the lovely welcome
In my side of the world 'brittle' is used to describe Bipolar in someone who does all the right things and still has episodes (that don't require necessarily a trigger to have the episode). I think fragility is part of it.
Not sure that makes sense?
I have woken up both manic and other times suicidal with no reason why. I'm even worse when I have a trigger.
I think my brain walks a tight rope sometimes.