Dr I Had My Bypass In 2000. 3 Month Back

Dr I had my bypass in 2000. 3 month back I had a problem of palpating my heart was beating fast on regular interval dr had given me Dilzem 30 which I was taking since 2 years but the Dr could not find any problem why heart was having palpation went several test like echo D stress test n blood test all reports were good then my heart Dr ask me to do a angiography which was also 100%clear after some times the palpation stop but dilzem 30 he asked me to continue by which my both legs r having swelling which I don't like can you suggest me another substitute tablet for Dilzem 30 so I can get rid if swelling thank you hope for a early reply