Hello Kindly offer the past 9-10 month i feel some day good and some days bad. Somedays when i feel bad suddenly my heart is beating very fast,.lose control, dry.mouth and feeling am.dying. sometimes it last for 1 hour and sometimes 20 min less or more. Some anxiety and fear comes to my.mind that am dying or need emergency. I died over 5-6 ecg and normal, 2 eco s and its normal. Currently am on concor cor 1.25 mg feel better than before but not perfect.