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    Another possibility that I meant to say in there when I was talking about quitting smoking, is that I’ve been using nicotine replacement. That in itself can cause heart palpitations and racing heart, so I cut my level down and am currently using 6 mg nicotine (started at 24 mg. the highest level – I’m using an e-cigarette). I have noticed that the frequency of palpitations is lower now that I’ve dropped to 6 mg. I also cut out almost all caffeinated beverages (I might have one twice a week now where before I was drinking caffeinated soda all day every day). So as you can see, there was probably more to it lifestyle-wise than just my thyroid. My doctor is aware of these things, but he brushes them off. It seems he’s made up his mind.