Hi. Depressive moods can be very difficult to deal with and during this phase, you should try reaching out to a close friend or relative. You can even make a diary in which you can note down your thoughts while you are in such a mood. When you are feeling better, you can read these thoughts to reflect on them and understand their root cause. Since it's having an impact on your studies, I would suggest consulting a psychologist to get an accurate diagnosis and treatment for your problem. But first please find a close friend or relative who you can reach out to during this dperessive phase. Take care and I hope you get better soon.

Check your Thyroid in a blood test. Consult an Endocronologist. Such behaviour may likely be because of abnormal hormone / imbalance.

Hello dear The above mentioned symptoms are indicative of depressive mood disorder. It could be due to your feelings about self and outside world. Try consulting a psychiatrist or a psychologist for proper diagnosis and treatment. Your prime focus of studying is also getting affected. Discuss with your parents.