Hello,
Thank you for your query at DoctorSpring.com
Acid reflux is due to neither.
Acid reflux occurs when there is a movement of the acidic content of your stomach or bile backwards into the esophagus (the tube which connects your mouth to the stomach).
There is a band at the lower end of your esophagus; called lower esophageal sphincter. Normally it relaxes and tightens with peristalsis to allow food that is eaten to pass into the stomach. When this sphincter weakens or is relaxed at inappropriate times, the stomach content freely flows back to irritate your esophagus and reproduce symptoms of heartburn and difficulty swallowing. There can also be additional symptoms such as spasm of bronchus, inflammation of the larynx and chronic coughing.
Hope this helps, feel free to discuss further

Hello,
Among the PPIs, Pamtoprazole has the least side effects. And it should be taken 40 mg, once before breakfast at least for 2 weeks.
Hope this was helpful,
Regards.