Hello and welcome to HealingWell,
Yes many people have posted about having GERD and palpitations. When you experience heart palpitations, you become unusually aware of your own heartbeat and feel as though it is speeding up and possibley even skipping beats. You might feel this sesation throughout your entire chest area and up into your neck.
To the best of my knowledge, neither GERD nor occasional heartburn will lead directly to heart palpitations. If you feel anxious about the chest pain that accompanies heartburn, however, and are worried that it is actually a heart-related problem, your anxiety could bring on palpitations. Heartburn can also lead to chest pain that may feel like heart palpitations but is actually due to muscle spasms in and around the esophagus.
The chest pain that accompanies acid reflux can feel similar to the heart-related pain of angina and, like the pain of angina, the pain from heartburn often radiates from your upper abdomen to your neck area.
To quickly assess the situation, pay close attention to the symptoms accompanying any chest pain or abnormal palpitations you experience. Nausea, sweating, squeezing pain and shortness of breath are symptoms that often accompany a heart problem such as angina, whereas regurgitation and a sour or acidic taste in the throat and mouth commonly accompany acid reflux.
It sounds like you have an extremely in depth work up - a whole week as an inpatient. Hardly ever heard of where I am from so I would keep in contact with your Drs. and report any new sx. to them.
Did your Dr. ever mention anxiety as a cause of your palpitations ?
Again a warm welcome.