Friend, the reason might be that you must be dealing with extraordinary stress , tension or pressure. You must look into yourself once atleast, so that you could find what you are. The best thing is to consult a phsician or a psychologist, as they might solve your problem. 
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r u a girl
yes i am a girl
plz reply to the message i've written to you. then only u could find the ans.
Its ok.It maybe because of the overload or missing your favourite teachers.Just be calm,revise and stay happy.Its not a big problem just because of over tension or something.Try to be active as before and read some story books,listen to music and enjoy the nature. =)
Hope it helps and pls mark as the best answer. :-)
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