High heart rate pacemaker patient.

Vvi pacemaker implanted ..2013.. pacemaker is ok .. 1month early suddenly abdomen swelled... And heart rate was 175. Doctor give ... medicine and tell that psvt case.. medicine prescribed 1)dilzem cd 90- twice daily 2) met xl 50-twice daily 3)lanoxin 0.25- 1/2 once 5days per week 4)pan 40- once daily 5)rivaflo 15mg- onece daily .. After taking this medicine heart rate was 90-95 always ... But suddenly after taking 2 week heart rate suddenly drops to 60... Like last night 90+ but in morning 60.. and from that day heart rate was 60... But after 5 days.. heart beat returned to 90-100... What can i do now... Any tips for reducing heart rate... Doctor told for ablation... But when he knows that heart rate returned to 60 ..he said dont go for ablation now... Help...now heart rate is 105 pressure is 105/65