that is a lot of procedures. If the medications are not working to control your heart rates and you have slow heart rates with escalating doses of medicatoins, a pacemaker is the next step. Sometimes we just can't get the afib to stop. Depending on your age, there are other medications. I assume because you are on amiodarone, the others haven't worked either (flecainide, propafenone, sotalol, tikosyn).
The only other options is to consider a trip to Austin Texas to have Dr. Natale decide if he thinks he has something to offer the ablation. Other large centers can help too, but Natale is very good and I trained under him. That is where I would send afib ablations that weren't working for a second opinion.
I hope this helps.
Steph