I would like to echo what everyone else has said here. I assure you, you are NOT alone in feeling this way, and sometimes there is comfort in knowing that others have had the same doubts/fears/issues that you are having right now. By speaking to your school counselor, advisor, or even a favorite teacher, you will be doing something proactive and brave for yourself, and it will help you immensely. Think of this as a medical issue (which it is) that needs to be addressed immediately. Hopefully once you start working on that side of things, the school question (leaving your current school? repeating junior year?) will fall into place. I’m wishing you all the best!