Hi, some advice and experience would be greatly appreciated. We have been changing drugs around to try and reduce the side effects - dizziness and tideness. I tried no drugs but found that without bisophonol I was going back into AF. Yesterday I started on Diltiazem 120mg to replace the bisophonol. Felt ok yesterday other than a dizzy spell in the shower at the end of the day. Today I woke up with that familiar feeling that I get when AF is lurking. I've now had a spell of very fast heart rate (220) for about 5 mins and it has settled back to around 75 (normal resting 55). Do I need to give the drugs longer or should I be considering another change? Thanks in advance for your support.