When I'm feeling very gloomy it's usually because I feel alone and that makes me restless. I just try to relax by laying down and listening to some good music (or bad catchy music), I call that ear candy (but if it's also a music video it's eye candy!) Don't worry about what you have to do, what people want you to do or be like. Just relax and do something that YOU want to do. Even though sometimes it's hard to want to do something but deep down everybody has hobbies or things they can do that make them happy. And remember:

YOU ARE LOVED

Not much but hope it helps :)