Yes! I have. I was four and a bit weeks post op and taking Pariet once in the morning. Suddenly it hit me. This awful feeling of lava moving around not only my oesophagus, but also around my tummy. I felt AWFUL and very flat. My gp (pcp) thought I may have H.pylori, but I had been tested for that - negative. My surgeon was going to give me an endoscopy when he decided to try upping my dose of Pariet. I worked my way up to FOUR tablets per day, plus Mylanta and it wasn't doing a thing. He tried Nexium (20mgx2 per day) and that worked after about three days. Still each morning I can feel the urkie feeling in my chest, but it goes away after I take the Nexium. Antacids like Mylanta are useless with our Industrial Strength Acid Reflux!! One tip I was given was to take Nexium on an empty stomach and wait an hour before eating. Also take it at night after dinner, but don't eat within two hours of bedtime. Refried beans tend to make mine a lot worse! Hope this helps.