I went back to school finally a couple years ago. Then my sister died and I just stopped being able to function. I was honestly convinced that would be it for me, but I completed a part-time distance-based course and did really well in it. I know that for me, I can't function when I'm in distress. I have OCD and agoraphobia and together between the two, terrifying things happen when I'm having episodes/symptoms, including thinking/feeling/seeing/hearing things I might not otherwise experience, having violent intrusive thoughts, and then being too overwhelmed by anything to leave my house. I think you should honour yourself. It might seem like leaving school would set you back, but if it's going to set you back more to stay, you'd be better off taking the break now. But the truth of the matter is, it looks better in the long run anyway if you take care of yourself first. Besides, if you continue with school, and continue to suffer at the same time, your grades and performance may continue to suffer.
Hope you get it all figured out. It sounds like you're going through some scary stuff right now. I empathize and my heart goes out to you.