Hi,im 25,yo male panic attacks 5 years now.i had all the heart test run ekg.than a rsting echo,than a a stress echo,all come back normal.im still having the fast heart rate,and sometimes it feels like it just stopped sometimes you know.Like the beat just stopped and its a crazy feeling,i try to say well the test came back perfect,but what can i do,in my mind i have a heart problem not structual i know that,but like beating is off..anyone help me out here calm my fears,i cant find a comfort zone,xanax used to work but thats all i take,and hot showers used to work..i read that a attack lasts 5-10 minutes in cases than why does mine last days on end help anyone?