This rings a bell... you may think I'm a bit nutty, but over the last few years I sometimes had the feeling - always in bed just before falling asleep - that my heart started a beat and then "waited" a while before continuing. I could literally feel that in my chest/throat, very unnerving. I'm almost sure it is related to this.

I read that the LQTS 3 version mostly happens when you are at rest or sleeping. This means it was probably not initially caused by amitriptyline, but surely can make be made worse by it.

I will ask the doc for an ECG, and I would not be surprised at all if you "called it". I will also propose to gradually go off the amitriptyline.

Thanks, as always.