it's your heart! you need to lay down is your heart beating really fast? if so lay down and drink a cup of warm water with a lemon wedge along with some honey! sorry but how much do you weight? if you are extremely over weight you need to alternate with a juice/water fast! it's your heart hun! relax and try your hardest to just lay down as much as you can! also if your arm is hurting it could mean you are having a heart attack! sometimes not everyone can fast longer and some can! now I am worried