i too was prescribed antenolol for  heart palpataions when they found i had a mitral valve prolapse. ive been on it for two years and i have hair loss, stomache problems, musclecramps and had depression. i would like to stop taking this medication to see if things improve but i am afraid incase i cause further heart problems. can anyone please give me some advice because im sick of my doctor telling me its probably more to do with my thyroid problem.