What will be your take to reduce stress and feel better

Relax
listen to music
eat healthy
do activities 

Exercise to increase endorphins.
Rest to strengthen immune system
Clean diet for a healthy gut which controls your overall health

Depression is lifelong, though you can get medication to with it. the difference between sadness and depression is that sadness lasts a little bit, depression last a long time and it goes on and off. people usually get depression through experiences they have been through, or genetics.