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The symptoms like someone is talking to you, talking to God or hearing voices which others cannot hear could be occurring due to some psychotic issue. Such kind of symptoms are not generally seen in depression. Since such symptoms have resulted in loss of performance in studies, poor concentration in studies, so please visit a psychiatrist for help and evaluation.
Drugs like Amisulpride, Olanzapine, Quetiapine, etc., can help you in coming out of depression and psychosis.