Hi HendersonS,
One of my most horrendous symptoms of peri, when it started, were palpitations. Frequently at night but also during the day. They brought huge anxiety ( or anxiety caused them, I don't know). I too, was 43 when I was started on Femoston. I too visited a cardiologist more than once, and got the all clear. Two things worked for me during that time, until HRT kicked in - valeriana tablets taken when needed, and then for about two months mild betablockers. BBs made me sleepy and headachy though so I gradually stopped them. Since being on Femoston, I haven't experienced any. It might be that you are low on estrogen? I know this can be one of the causes of palps. Very unpleasant!!! I hope you will find a way to manage them.
Milamam