Anyone have this done?

An esophageal pH monitor measures the acidity inside of the esophagus. It is helpful in evaluating gastroesophageal reflux disease (GERD). A thin, plastic tube is placed into a nostril, guided down the throat, and then into the esophagus. The tube stops just above the lower esophageal sphincter, which is at the connection between the esophagus and the stomach. At the end of the tube inside the esophagus is a sensor that measures pH, or acidity. The other end of the tube outside the body is connected to a monitor that records the pH levels for a 12 to 24 hour period. Normal activity is encouraged during the study, and a diary is kept of symptoms experienced, or activity that might be suspicious for reflux, such as gagging or coughing. The pH readings are evaluated and compared to the patient's activity for that time period.

I had an upper endoscopy yesterday (which she said seemed normal) but said this is the next step (I've got persistent Laryngopharyngeal reflux - acid in the stomach that comes up into the throat at the level of the laryngopharynx as opposes to GERD which is caused by the backflow of gastric contents into the esophagus, which leads to tissue damage or esophagitis and heartburn.)