Why are my hands so shaky?

A little less than a month ago, I had this issue with my hands vibrating constantly throughout the day. It got so bad that i couldn't hold a pencil without dropping it and got especially worse after running. I am of average height and weight for my age and am pretty good at athletics. Blaming it on major caffeine buzzes, I quit drinking coffee and it seemed to slow down dramatically, however, recently, I have begun to shake again even without the caffeine and it has become very problematic. I was designated cameraman for a cl project because I am studying to become a photographer, but the constant shakyness is going to cause many problems... Does anyone know whats wrong with me? D: