Your calamity Jane quote says it all! Which I love btw, what a show!
I think Buddhism is a valuable wisdom tradition of BP folks because the first noble truth is the truth of suffering. But the 4th noble truth is the truth of the cessation of suffering. There is also a Buddhist instruction for hard times, 'like a log remain', do nothing, it will pass. It is hard to imagine when feelings of extreme self loathing wash over you, that they are ephemeral, not real, and not really based on who YOU are in some essential way, but rather a kind of bi product of a certain kind of mind that you just have to wait out.
I was dealing with some depressive stuff last night. Felt so flat and numb, and also irritated and bothered by everything, but completely without the motivation to do anything, but also without a clue what to do. And I was getting scared about it, like are these periods just going to get longer and longer?
But now I am fine. Weird.
It will Pass J, we are here, hang in!
A bit of a ramble, but I hope it helps somehow!

MT