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i have no pyrexia .no headache . i have a cold which is subsiding. i am on levothyroxine125mcg but i do not think it related to yesterdays high hr as i took on day prevoius to that and nearly 24 hrs lapsed prior to symptoms . i have had a couple of sudden rapid hr in last 18 months/ last occasion had ecg which dropped to normal sinus tachycardia 0f 120 min at rest,this seemed to resolve itself on both occasions/just took me off my feet for a day or two.