I have had many thyroid symptoms for a while now but my tests keep coming back in the "normal" range. I also have a benign nodule on the right lobe.Recently I have had terrible heart palpitations that were cured when I took a multi vitamin /mineral tablet. I suspected iron deficiency but my doctor is thinking about something else but wants blood test results first. I think he's thinking of B12 deficiency dietary or pernicious anaemia. I know there is a connection with thyroid and pernicious anaemia. Does anyone have any experience of this so that I can be more aware when I go back for my blood test results?