Here are some hugs for you ((((((((((madisgram))))))))))

I'm so sorry you're feeling very low. And I'm really sorry too that your pdoc is being so incredibly unhelpful. I'm glad to hear that you are planning on filing a complaint and then changing to a new doctor. It's good that upping the Lexapro helped a bit. I'm wondering if you can have more contact with your T between sessions? Some Ts will respond to emails and will also return phone calls. I check in with my T like that sometimes because I don't get to see her very often. Of course it's not as good as a face to face session, but it's something.
Wishing you all the very best and sending more hugs!