Time to see your doctor! At your age (46 years) these symptoms could have many causes and be related to these palpitations, or an underlying heart problem (or nothing serious). Without a consultation and testing there is no way to diagnose whether you have a problem that requires treatment, or whether these are related to early menopause. You should check your cardiac risks and calculate whether you are at risk of developing coronary artery disease (CAD), stroke and cardiovascular disease (CVD).
Hope this helps.