Saturn( daily activities hard work), Moon ( emotional and thought process), Rahu ( desire and materialistic) and ketu ( Spiritual and no attachment). when these planets are placed in debilated signs and aspects each other as well as above mentioned planet Dasha runs then a person suffers from depression and anxiety. it only happens during your Dasha period as daily life activities conflicts with desires, materialistic and spiritual.one feels stucks and loses path. instead of fighting against it, better let the time guide you as it will lessen your anxiousness and sadness.