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A condition called Supraventricular Tachycardia.... basically an abnormality in the nerve impulses of the heart - I get erratic heartbeat, ectopics, palpitations (imagine a heart rate of 200+) !!
I've had it since I was 12, but it has worsened in the last few years and I'm due to have an op to correct it (hopefully) next month. If all goes well, I shouldn't have to take the damn tablets anymore - which is good cos I'm finding that with such a high dose these days they react with alcohol - not good! !