Usually, the onset of a depressive episode is characterized by an individual feeling low on energy, empty and hopeless about everything. Besides, he/she can also experience any of the following symptoms:
Feeling of guilt
Increased fatigue and tiredness
Loss of interest in activities he/she find pleasure into
Poor concentration affecting decision-making ability
Restlessness and irritability
Unintentional weight gain or weight loss
An abrupt change in appetite
Suicidal thoughts