I used to get a lot of palpitations when I went through the change of life. I had no idea it was hormone related. They even misdiagnosed me with mitral valve prolapse!!! Found out a few years later that I don't have mitral valve prolapse.
Nowadays the prednisone sometimes gives me palpitations. It could also be stress related or you could be having panic attacks. In any case, see your family doctor to be checked out.