@nelson1996 I can't advise you about this because I'm not qualified and because I know nothing about you. What I can assure you is that your cardiologist is the heaviest hitter with the highest batting average on your team....so there's that. You can always tell him that the first sign of your drug, whether a drug you're used to or a newly prescribed one, not working well, you're going to stop using it immediately. There is often no need to 'wean' yourself off of a drug unless the monograph that the druggist gives you, or the doctor does, says not to discontinue it suddenly or without a doctor's say-so. I discontinued metoprolol cold turkey, but only when amiodarone was prescribed instead of it. So, it was a 1:1 drug swap, not cessation of a drug and taking nothing else.
As for instructions for your actions prior to any medical intervention, you should follow them. Not only are they definitive, and you don't know any better, but the person caring for you is relying on you to be a predictable patient in terms of your bloodwork, your readiness, and your having followed his/her instructions. IOW, for God's sake, don't confound the help you seek by doing 'your own thing.'
About medications and prophylaxis after an ablation: many/most EPs will ask you to take a limited quantity of a drug they know you have tolerated and say for how long to take it after your ablation. For some it's propafenone (Rhythmol), for some it's diltiazem, while for other's it's amiodarone, Flecainide, or just metoprolol. Look, none of us particularly likes having to reach for a pill vial and swallow one or two tablets twice or three times each day. But the EP knows what works for him across patients, and will routinely prescribe what he/she thinks is best to get her patients' hearts calm and healing in the five to six weeks prior to wearing the Holter monitor for the post-ablation assessment (usually at about the 10-12 week mark). If the EP does a good job and isolates the problem area in your left atrium, then you will have a good Holter monitor assessment. Ideally, the EP would ask you to taper off and to cease any meds except for the anti-coagulant about two weeks prior to the Holter. That way, the Holter is reading your 'true' heart condition rhythmically, and not a doctored-up rhythm kept under thumb by drugs...only.