I am still in the process of waiting for tests but have unofficially been diagnosed with POTS. I have been having very regular faints, pre faint episodes, rapid + strong heart beat resting and particularly standing, along with things like general weakness and exercise intolerance for the last few years. Doctors first thought it was due to overactive thyroid which is now sorted so have been passed on to Cardiology who from my own blood pressure and pulse records has told me I almost certainly have POTS but need tests done to officially diagnose and check nothing else is going on.
However in keeping these records I have noticed that often when I lie back down after things such as stairs (or sometimes after just lying) my pulse is dropping suddenly from well over 120 to around 50 within 5-10 seconds and with this I have suddenly been feeling faint as well as quite a heavy pressure feeling on my chest and complete weakness. The Sao2% on my monitor can often drop to mid 80's as well. I have been unable to measure the worst times but now suspect this is what is happening again. I can apparently become completely unresponsive yet I am still vaguely conscious just unable to move or respond at all, normally for about 15 minutes but up to a couple of hours (apparently one of the more extreme symptoms of POTS when mentioned to doctor). My heart rate often goes back up to normal sooner than I recover but generally I feel much better as it goes back up. But what I'm wondering is, is it normal in POTS for my heart rate to drop quite as low as that when I am definitely not an athlete at the moment and when occurring with those symptoms? My current normal resting pulse rate is about 75 (70-90) so it is much lower than recently (a few years ago when fit and healthy around 60 was normal for me).
So I'm wondering if this is normal with POTS or if it is something different and whether I should be talking to the doctor about it?