I posted part of the following information previously but my swallowing was affected by my Hiatla Hernia also. Because of the hiatal hernia my LES and a portion of my stomach slid back and forth into my chest cavity. In effect, my stomach was hour-glass shaped--part above the diaphragm and part below. Whenever I swallowed, a lot of the food stayed in that upper chamber of the stomach and was free to flow back into my throat or it would trickle into the lower stomach by gravity flow. If I ate anything within a few hours of going to bed, I knew it would reflux and I would be coughing all night trying to rid my throat and lungs of it. So, very often I forced myself to vomit in order to empty the esophagus prior to going to bed.
Prior to having my Manometry test I knew that my swallowing action was being interrupted. I could feel the food going down part way, but when it got to the upper hour-glass chamber it stopped and could only gravity flow from there and I told the technician what I thought the results of the test were going to be.
When he put the probe down through my nose it went smoothly and he began the sipping part of the test. he didn't get the results that he expected so he fished the probe around and started the test over. It still didn't seem right so the fishing continued to try to get it to the proper depth. After the test was completed I went home but they called me the next day and told me that they had to do it over. The Doctor reviewed my results and knew something was wrong.
The next tests were done by the Gastroenterologist and he did it as a training session for his entire staff. He had determined that when the probe went down the first time it hit the curved part of the upped chamber and started back up. When he inserted the probe, it didn't go so smoothly--I gagged and vomited until it finally got down and then he was able to position it properly. That test likewise indicated that I had a limited swallowing action. As a result I had a Hiatal Hernia repair and a full 360 floppy Nissen. I couldn't be happier with the result. In the past year and three months since the operation I haven't had one incident of reflux or heartburn and I can eat anything that I ever did prior to all of my digestive problems. I hope you will have similar results.