I'm sorry you are having so many problems. I had an PNS system implanted on July 9th & fortunately I've not had any problems with it. My battery is in my upper chest ~ 2 in below my collar bone, and my leads are in my face (supraorbital & infraorbital nerves).
Where will they be putting the battery this time? Your abdomen? My battery has worked out well in my chest, but I don't know if they can put yours up there, because your leads are in your back (mine are in my face). The only downside to having the battery in my chest is that it takes longer to charge, because my feminine contours make it hard for the battery to communicate with the charger -- although it's a lot better now that my rep gave me sticky things to use to hold the charger in place over the battery.
Best of luck with the surgery! My only question would be, how do they prevent all the same problems from happening again?