Hi,
I have read your question and I understand your concern.
The symptoms that you prescribe lead me to think about 
Esophagitis. It is an inflammatory disease of the 
esophagus caused by long-term exposition to  high 
gastric acid output. It is associated with pain in swallowing, difficulty in swallowing and GERD. This is a serious condition that needs to be addressed as soon as possible because it can lead to Barret's Esophagus, which is a malignant tumor of the Esophagus caused by the chronic burning of the esophageal cells. You have to visit your GI and do a endoscopy and biopsy of the affected tissue. This is your first step.
Next, you have to work out with your doctor what is the cause of the persistent high gastric acid output. It seems like your GERD is very resistent to treatment, and this can have different causes. I will mention some that seem most probable in your case:
1. 
Depression, anxiety and other psychological stress can affect the production of your gastric acid and cause a chronic GERD/Gastritis?Ulcers.
2. Smoking and drinking. They have the same effect on gastric acid.
3. 
Zollinger-Ellison Syndrome. This is caused by a tumor producing gastin, which is the hormone that induces the production of gastric acid. It is resistent or mildly affected by PPi and other GERD drugs, and is often associated with 
heartburn, IBS and ulcers leading to Esophagitis. Your doctor will have to measure your Gastrin level and acid output levels to diagnose this condition. It can be confirmed by an 
endoscopic ultrasound (ERCP). I would also chech Calcium levels in your blood to exclude a MEN1 syndrome, often associated with Zollinger-Ellison. 
Hope I have answered your question. If you have any further questions I will be happy to help. 
Wish you good health,
Eni Manoku M.D.