So sorry you're feeling that way. I also ruminate, it's a terrible thing. Your situation sounds very complicated and stressful. I can only try to comment a little about your tension with the teacher. This is just my own strategy and from my own experience, so it may not work for you, but when I'm either struggling in a class or a teacher expresses displeasure, I always try to talk to them one-on-one to resolve it, even if I have to apologize (whether I feel I should apologize or not) and be self-deprecating. "Oh, I'm really sorry, it didn't occur to me that I couldn't submit them like that, you said XYZ and I guess I'm just really literal. Anyway, so ideally how should I be doing it?" And so on... If the moment has passed, you can find another excuse to interact with her, like to ask a question and show you're engaged? I think if you're apologetic and/or show her respect, it might smooth things over and also might reduce your anxiety. When I apologize to people (whether I mean it or not) and they say everything is OK, I often feel much better. Your goal is to pass this class. Getting this teacher more on your side is just part of the coursework. Anyway, don't give up on your studies! Getting through classes, acquiring certificates, etc. is so important in terms of improving one's life and creating opportunities for oneself. It's also great to want things, and know what one wants. Make a list to help keep your determination up?