I am a 56 yrd olf woman, I went to hospital tonight as I havr benn coughing and ws increasingly getting breathless . I was monitored and given a drug which is applied to the oxigen you are given, that normilised my breathing , but I got home and my hear rate is 133 palpitations per minute. Is that normal, is it the effect of the medication , should I be concerned, what should I do?