I have been having heart palpitations for over a week now. I do have a history of suffering from anxiety and panic attacks. I am over weight female with Hypothyroidism (currently on 200mcg synthroid) and PCOS. I have been exercising regularly for the last 4 months (and have lost some weight) but I still have to work more on my nutrition. I have suffered from palpitations in the past but they usually subside after a few days and they have always been sporadic. I don't remember ever having palpitations lasting every day and all day non stop for a week. I'm considering visiting my GP over this issue. I saw my doctor last a few months ago about my palpitations when I started exercising regularly and she performed an EKG and it I remember correctly it came up clear. Palpitations went away and not they are back.