If you think you have a heart issue, by all means see a cardiologist. I had palps, rapid
heart rate as well, when I first started
cytomel, but once I got used to it, and my levels stabilized, those went away. I did get sent to a cardiologist for a complete work up on my heart, just to be sure..
We are all different, so what works for one, might not work another. Some people just can't tolerate having high levels of thyroid hormones.