Hi @Natsubi, I too had heart palpitations when taking Letrozole. I stopped taking the tablets. My oncologist also said it's not one of the side effects, but at least he moved me onto another drug. So now on Exemestane. This one has just started giving me aches and pains.
I don't believe these medical professionals can say they've never heard of these side effects when you only have to read on this website all of the experiences the patients on here are experiencing.
How come when we stop taking these drugs we feel better?