Op, please go to you GP and explain this. As someone who has suffered from from and been treated for depression, I could have written all of your posts.
I once went 6 days without showering. I can now look back and see how bad that I got.
Going to a GP was the first huge step that I did. Not being able to sleep is such a marker, and I too had a non sleeping toddler.
After that, it has taken time and a lot of pain, but things can and do get better.
Little, tiny steps. Do one thing, don't try to fix everything at once.
Each small step is a huge step.
Good HCP know this and are there to help.
Google I had a black dog, his name was depression. took me a while to get up the courage to watch it as I was in denial, but it made me realize I was not alone. And actually, that a I was quite normal.
I'll never be the size 6 glamourpuss I was, but fuck it - I can blame it on the child, not the fact that I am 40 :)
Good luc