Sorry to hear what you're going through, its so difficult when others dont get it.
You are going through a lot with more uncertainty on top, so its not surprising you feel the way you do, especially as you're going through it all again. You are not a failure, just going through some difficult stuff, that's all.
If you think its the right thing to do, maybe dropping hours might help as it would give you more space until this is resolved.
Also, there is employment advice here or on the macmillan site which may be worth looking at.
It will move on & wishing you all the best