Have you gone to your school counseling center, seen if talking to someone there can help? That's what I did "first", when I was 20. Therapy doesn't always involve psychiatrists and medicine. I would just see what your school has to offer, maybe talk about the break in the relationship with your roommate and stresses you're under and see how it goes. You get to control what you talk about; I'd see if I could find stuff out before your mother gets into it and tries to "force" you.