I liked this post with a "love," meaning sending you love and strength, not that I loved what angst you're going through! Also Love for the update on your flock, and that you reached out.
I wonder if because chickens are so good at hiding their problems, they appear "easy" to take care of to many people. Then they inexplicably die. I think this is distance flock-raising. Those people throw out some feed and water, collect eggs, and walk away.
But the more one learns, and learns what to look for, or even notices because one is paying attention and spending time with them, the more complex the picture becomes. They are each our children to a lot of us here. This isn't an original thought of course.
My farmer friends - she is really attached to her goats, knows them all as individuals, and thinks the chickens are easy, comparatively. But the chickens are not her thing, nor are they under her care primarily, so she doesn't engage with them at the level her partner does.