Hi Silverleaf...
I am waking up at night with a racing heart, beating hard and fast. It's not skipping beats or doing weird rhythms and if I get my Kardia ECG device out I always get a normal ECG - it's just hard and fast.
I've had an echocardiogram (normal) and a few ECGs, both at the hospital and with my Kardia (which I then email to a cardiac nurse) and they have all been normal. I've taken beta blockers (bisoprolol) but they take the edge off things but don't totally stop it - so I stopped taking those after about 1-2 weeks on them.
Are you sure some of those things you list, like tingling hands and feet and being cold, are due to your beta blockers? Only because I also have those symptoms and they are def not caused by the beta blockers (I'm not on beta blockers now and still have them). All those symptoms can be thyroid symptoms too and if you have a history of Hashi-s, then I'd think you should see a thyroid specialist and get fully 100% tested on all things thyroid (free T3, free T4, antibodies again, reverse T3) and ensure your thyroid meds are optimal for you.
Your symptoms sound v similar to mine, really - except I mainly get them at night and am fine in the day. I have inner tremors, which can feel like buzzing or fizzing or tingling, especially in my feet, and my heart beats hard and loud. It's very hard to sleep through all that and sometimes I also get hypnic jerks before I fall asleep. When I do get to sleep, it's light and I wake frequently. This has all been going on for 18 months now and I'm exhausted. I refuse to take hardcore drugs like pregabalin which some doctors have tried to prescribe - because I see that as just treating symptoms and not the root cause.
The one thing I've found (as I mentioned above) is the high rT3 for me. For me, all my thyroid tests were totally normal - including the Advanced Thyroid panel which Medichecks offer - but I dug a bit deeper after someone on Facebook suggested I get my reverse T3 measured and I found it was sky high at 32. Have you had your reverse T3 tested? I had my thyroid appointment a couple of days ago (had to wait for ages!) and it was excellent (private appointment online with thethyroidclinic.co.uk ) - they are sending me some T3 to take. I have to wean onto it, take it for 6wks and then wean back off and then re-test bloods. I have no idea if my symptoms are related to hormones/estrogen or to this high rT3 but taking T3 will be a 'test' of that - if it gets better, we'll know... so it's a sort of diagnosis by trial treatment really...
Meanwhile I'm on 3 pumps of gel now and supposed to increase to 4 if symptoms continue. But I might try the T3 first as I don't want to change too many things at once or I won't know what's causing what...
The other thing to ask is what your ferritin level is. It should be over 100. Because iron deficiency can cause some pretty wacko symptoms like this too....