PB'ing is productive burping but its like something productive coming up when you burp lol . When you eat something that gets stuck what happens is you burp but (i hate to sound gross) slime comes up with the burp. I helps with getting what ever you have stuck unstuck. It sounds gross but when you have that awful stuck feeling PB'ing is the best feeling. How long ago did you have your surgery? I had mine Nov 2010 so I am still kind of new at this myself. With my first fill I felt nothing and could eat everything as a matter of fact I gained some of the weight I had lost with pre-op diet. With my second fill I got alittle ristriciton but not much and didn't loose much weight either. But now with this 3rd fill I can see how I will loose weight. I was finally able to eat something last night, I now know I have to change my eating habits, like have a protine shake for breakfast, soup for lunch then I can finally eat more for dinner. Hope everything works out for you