Constant Burping

Hey everyone! I was sleeved back on May 17 and up until this point I have had absolutely no problems. However, for the past two weeks or so, it seems I am constantly burping; I can open my mouth and something will come out or can I easily pull one out of my stomach. I am taking my Nexium religiously and haven't had any heartburn. When I contacted my surgeon he said it probably wasn't reflux and called me in a prescription of Reglin. I've been taking it since Saturday but haven't really seen an improvement. And to be honest, while the burps were simply annoying at first, they're now starting to give me a bit of discomfort. Any ideas what's causing this? Should I keep taking the Reglin and let it work on me for a little while longer? Or does this indeed sound like reflux and I need to go on something else? Any advice would be appreciated. I'm still loving my sleeve though!