You need to be getting some adult help ASAP, does your advisor know that you are crying every day and can’t sleep? Do your parents? Can I suggest going to the nurse or whoever you got to there and talking about exactly what’s going on and honestly how you are feeling. There must be a counselor or therapist at school you can speak to, 3 weeks is too long to be going on in the crisis mode you are describing, please go talk to someone.