How stressful for you to have your referral declined like that. Did they give any reason? I had long episodes of palpitations lasting up to an hour at a time 24/7, at worst in 10-day lead up to periods however long the cycle & especially bad overnight. Lasted for around a decade from start of peri through to several years post when I finally started HRT & had a change of thyroid medication. They are horrible & I feel for you.
The short ECGs as you say, can easily miss irregularity & at very least I'd have thought they should arrange for you to have a Holter monitor for 24 hrs & I would politely push for one for your own peace of mind. It took a while for them to organise one for me & that was after a wide range of cardiac tests from echo through treadmill. The Holter was issued just before a bleed when my palps were at their worst so I knew for sure they'd captured what was going on. Diagnosed with benign ectopics, but it was 15+ years ago when there was so little awareness of the wide ranging effects of menopause & none of the medics could say with any certainty what the cause was, so there was still no real reassurance. I'd done some research & knew palps could occur in menopause but really wanted some certainty my thyroid condition wasn't to blame as this was an extra worry I could have done without. Eventually, several years post, I met a good Meno Specialist who'd previously worked in Cardiology & she confirmed ectopics are quite common in menopause. Would have been so reassuring to meet her a decade earlier!
Glad you are going back to your GP. It's almost certainly nothing serious, but like you I wanted more certainty over something they should really not dismiss. Please let us know how you get on.
Wx