When I am unhappy I usually clean something so if something gets you down clean your house or room, organize a shelf, or anything to do with organization or cleanliness. Being in a clean environment makes it easier to appreciate and enjoy being alive. Plus cleaning takes your mind off of whats upsetting you in the first place.
Step 2: Take a shower
Sometimes when your so deep under just go take a shower and think about all the things that are stressing you or making you unhappy and try to come up with a way to solve them. This leads to your problems seeming simpler and not as bad.
Step 3: Getting Productive
When I am upset about life,school, or something worse like the fact that were out of milk I try to build something, draw something, or just think about something creative. I hope doing these things will cheer you up