I've been posting about my heart palpitations in the other forum above here, 'All things menopause'.
I've had flutters which literally went on all night. I went to A&E the next day, which was just this bank holiday past. My blood pressure was 158/85 (usually perfect at 120/70) - I work out 4x a week and I'm 9 stone 6lbs and 5 ft 10, so v slim! And I'm 44yo. My ECG was normal. They reassured me that I wasn't in imminent danger of anything and advised that the correct pathway would be to go to GP, get a cardiology referral and then probably 48hr holter to monitor heart and maybe echocardiogram.
For me, this has all started since beginning HRT. I did get the typical skipped beat thing before I went on HRT, especially in the evenings and at night. I wasn't worried about that because I knew it was a v common peri symptom.
After beginning HRT in March, I think I was okay at 25 patch for 2 weeks but on the 50 patch I started to feel myself throbbing sometimes. It felt like the mattress in bed was moving under me, or I could feel myself pulsing against a chair I was sitting on. I also was occasionally getting higher than usual blood pressure readings - not as high as when I went to A&E, but like 144. I was getting 'irregular pulse' readings about 50% of the time on the blood pressure monitor. My Kardia ECG device was giving me weird results sometimes, like Sinus rhythm with wide QRS. When I went up to the 75 patch, this happened every single night the first week - and ALL NIGHT. I also couldn't sleep, as it's impossible to sleep whilst your heart is fluttering away like that. I just dozed semi-consciously and was exhausted the next day. I got really anxious about it all at this point and it's when I went to A&E.
I reduced my patch down to 62.5 (don't ask, I didn't want to go back to 50 because my estrogen was only at 233nmol at 50). I've felt much better since going to A&E and haven't had another bad night like that. I am now living in fear of it happening again and this is really tricky because feeling anxious makes it more likely to happen, so I am constantly telling myself to relax and breathe and doing meditation and breathing apps etc etc!!!
I've come to the conclusion that I'm really sensitive to estrogen and if I change dose, I need to do it very gradually and slowly. I was at 50 for 7 weeks before increasing to 75 but I wish I'd waited 12 weeks and until I had zero symptoms like this at 50, before I increased - and then split the increase to 62.5 first. (That does mean cutting a 50 patch in 4 at the moment for the extra 12.5
but in future hopefully I can get some 25 patches and cut those in half!!)
I have a review with my menopause dr on Weds this week and I will ask her if she thinks I should go get all these tests run now, or if I should wait for the HRT to settle for a couple of months. I don't want to do the tests and have all kinds of weird and worrying results which are just due to hormones and might fix themselves anyway. But I also just don't know if I can continue to live like this, if it doesn't settle. I hope I don't have to come off HRT. I am probably catastrophising.... 
joziel, thanks for sharing your experience. You're braver than me I won't use kardia or take my bp or anything, there is a reason for this anxiety that I can't put publicly, but at some point I need the doctor to give me a check over. I never want to know my bp, I just tell them if I don't need to do anything, don't tell me what it is. But I have a specific issue about it all.
Did you mention the kardia results to a cardiologist? Just curious what wide QRS means to them. Most things are not worrisome, was just curious. Also curious if the doctors think hrt is responsible for all this, but it sounds like you're on the case with making the necessary changes, etc.
If anything my flutters were better on HRT, but I'm messed up my regime atm.
I wish you all the best, let me know how you get on
