Amidst all the darkness, it is great that you have your partner who seems to genuinely care.
If I am interpreting your message correctly, you seem to be feeling as if in a limbo. This is how I have been feeling lately - a toxic mixture of fatalism and optimism. Not enough strength to face life head on (too many disappointments in a short period of time) but at the same time a refusal to believe that there's only bad stuff coming my way... It's as if the universe, for some reason, wants me to understand that I can't die, but I can't live either... As if I've reached maximum entropy and don't know how to reset. I don't know...
It seems that the wisest strategy is to hold on and hope that things will get better eventually. This has happened in the past. This time I am so conscious about my suffering and not so naïve about people anymore, and this makes it uniquely unbearable. But still, if I can't CTB (too hesitant and unmotivated, perhaps afraid), I guess I will try to wait it out, the same way you do with some illnesses.
I hope that sharing these feelings of mine helps you in some way.