You have GERD for the same reason that you are constipated (which straining causes hemorrhoids): a diet poor in fibers and rich in poisons like alcohol and sugar.
Half of the sugar molecule is fructose, and fructose is almost as poisonous as alcohol to your liver.
Chronic alcohol and fructose consumption leads to liver dysfunction that causes acne, diabetes II, heart disease and GERD and other GI problems.
I know that you are going to ignore this. Sometimes you just need to find out on your own.
Except that this kills you and there is no learning from your death.
I had GERD for 3 years, treating it with medication.
My liver failed somewhere towards the end of May, 2012 and I developed hepatic encephalopathy. I reacted very poorly to the treatment of hepatitis and hepatic encephalopathy, which should have left me in a PVS or dead.
5 years later I learned about the liver and how all of Americans are doomed.
"Sugar: the Bitter Truth " on YouTube
"Fat Chance..." by Dr. Robert Lustig M.D.