I can understand your frustration and perhaps you did what i used to do. i'd say, "i'll be better tomorrow. i won't feel as bad as i do today." well the next day came and i felt worse and so on...it took time but i learned that if i felt a shift in my mood or it went on for 2 days, i needed to call my pdoc cause i was headed for down under.
believe me, you are not stupid (as you call yourself). it's just getting to know when there's a "danger" warning sign ahead!i'm sorry that you will be leaving your friends. it's not your fault...just practice on "listening" to your mind and moods. hopefully you can return to school next term and you'll have gained some insight on how to avoid this happening to you again...we all have had similiar experiences or fall backs. please try to be good to yourself and try not to beat yourself up. we care about you.