Personally, I've stopped looking at it as "needing to get better" and now instead look at it as "keeping suffering as minimal as possible."
For me, this shifted my focus to just getting through one day at a time. Not thinking about yesterday, or tomorrow. Just today.
This doesn't mean I've dismissed the idea of "getting better" -- it just means I don't worry about it anymore. If treatment happens to make things better, great. But I've let go of the idea of "better". This seems to have relieved a lot of that pressure that I used to put on myself, and it has allowed me to let go of some of the guilt and shame.
It's still very, very hard, and I still deal with a lot of guilt and shame... and I'm not sure what my future looks like... But otherwise, I did find some relief in this shift in mindset.
Now, some people might construe this as "giving up." But for me, I call it "surviving."
I don't know if this is the right thing to do. I don't know if it's right for me, or if it's right for anyone else. For all I know, I could reach a crisis point again and get totally derailed at some point. But this is what I'm doing right now.