Was Taking Nexium 40 Mg Daily Since June 2013 ,

Was taking nexium 40 mg daily since June 2013 , was switched to rabeprizole 20 mg as nexium seemed to stop working . I am experiencing abdominal tightness and burning I also have to take two Zantac 150 to get some relief . I am having an endoscopy this week . Also was on three rounds of cipro for an infection three months ago