I never had issues with acid before surgery and I'm in my 40's. 2 weeks post op I developed HORRIBLE acid problems. After trying Nexium and Prilosec, they finally switched me to a new medicine that is called Dexilant. It has been amazing how much better I feel, thank God!
My point though is that my surgeon, while discussing my acid problems, told me that if you have reflux prior to surgery, it usually gets much worse after VSG so they dont do it and go right for the RnY bypass.