Justtosee, the first place to start is with an appointment with your doctor.
There can be physical causes for your symptoms (and there can be physical causes for depression) and your doctor is the best person to help you figure out what you need to do to address this.
If you are a minor and you still live at home, please ask your parents to make an appointment for you as soon as possible.
If you are out on your own, please call your doctor today and make an appointment. If you are at college, your campus infirmary is a good place to start.
Good luck and get going!