As your history suggest you are having cardiac arrhythemias, but the to find out the cause a lot of things have to be done. Like your Thyroid function tests
, cardiac echo, cardiac electro physiologic test and routine blood electrolytes with Ca++ and Mg++ levels. Even though with these tests a lot of Arrhythmic patients cause remains unknown which is a major bulk. There is no literature suggesting any relation with drinking cold
water, but literature says exposure to chilled water causes arrhythmias. If you feel that cold water drinking precipitates it then prevent it.Hope this explanation helps.Please ask if you have any more questions.