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Depression can be normal and can be a disease. Depression is diagnosed when a person has low or depressed mood for most of the day every day at least two weeks, lack of interest and pleasure in daily activities, other symptoms are sleep disturbances, appetite changes, poor concentration, pessimistic thoughts, feeling guilty, hopelessness, thoughts of ending life. It is multifactorial. Your history is suggestive of depression as you have mentioned that these symptoms were in the past also, try to find out what is causing your depression. Any current issues or any past life event?
Tablet Escitalopram 10 mg at night, tablet Alprazolam 0.5 mg at night if sleep issues, lifestyle modification (go for walk daily, meet with your friends, share your problem with whom you trust), psychotherapy sessions.