Welcome to HealingWell and the GERD/Heartburn Forum. I am Kitt.
You may want to review this thread just FYI and check out the weblink posted. https://www.healingwell.com/community/default.aspx?f=45&m=1483795
Please don't feel you have wasted your time having a scope. I know it is frustrating but perhaps the Nexium will be a better drug for you. Each person reacts differently to the medications.
Also there are other tests if you continue to have issues.
Again a warm welcome, Kitt