I saw a cardiologist a number of years ago when, it turned out, my thyroid dosage was causing problems and I thought I was having a heart attack. But I have not seen one since. At this point, I'm hoping it isn't an issue and, for me, I'd be reluctant to be put on any more medication. Your doctor obviously felt that it was necessary in your circumstance. I'm sure you are relieved that your symptoms have improved! Thank goodness!