What Would Cause Hand And Sometimes Just Finger Tremors? I

What would cause hand and sometimes just finger tremors? I am 60 and on beta blckr and ace inhbtr, high cholesterol and reflux mess. I blv I he an cuto immune...there are 14 different ones in my family farm mom and dad their siblings down to and including my niece. There have been a multitude of Drs I he seen and pretty well gave up except keeping track of how I feel and things that happen to my body. Thnx Diana