Heart palpitations , fear , sleep disord

Dear doctor I'm Alex 26 year old boy from few days I'm suffering from cough khanshi and heart palpitations on bed at night sometimes I feel suddenly my heart beat has been increased and due to such type of incident I fear and can't sleep properly I visited my nearest physician Doctor sir asked everything I told him  I usually smoke cigarettes but from 1•5 month I quit completely and now I'm feeling such type of problems he told for ecg I attached here ecg report kindly review my ecg and give a proper advise please Doctor sir prescribed some medicine 1 Azee 500 2 Bilasure M 3 Beta anxit 20 4 norvent d syrup my cough colour sometimes brown like soil mix and dust mix while I didn't contact to dust