About a year later. My have sudden mood changes. When I'm at school I'm a week student but suddenly sometimes I feel like energetic. Have a very powerful brain. Feeling very happy. Very social. Creative. At that time I can do mathematical calculations than the best students in the class. I feel like I'm a very clever student but that ability last only for about 10 or 30 minutes. After that I become a week student. As earlier I can't understand this. Please explain this to me?