Let your doctor know about
what happened before the Nexium, and see what he says if you have not already.
If you dont stop the Nexium, the PH probe wont give good information, and GERD may be overlooked.
If it comes up ok, then they can start looking for else. It could be something to do with your stomach, sinusues, or a combination.
Trust me, there are lots of people out here with similar symptons.