I'm experiencing periods of depression which last from 2-3 days to a week. After that everything seems normal and sometimes I feel very good, have high self-confidence and feel elated and energetic. During the low phase, I feel really down and depressed. My mind is constantly racing with unreached thoughts. I have trouble falling asleep. I am filled with feelings of low self-esteem. I feel paranoid. I think it'd be better if I got into a coma or something (but not death).