You can't depend on them to help you. You must help yourself.
Your doctors have been doing far too many tests on you. They are not in proper order of priority.
These two are necessary:
EKG - is it normal?
Endoscopy - normal, that's good. Did the doctors mention anything about inflammation, esophagitis?
These are missing:
Barium swallow, manometry and PH monitoring are the diagnosis tests for GERD.
Your doctors leave them out. They must have suspected other causes than GERD.
I feel unlikely you have Crohn.
If you ask me, I would say your stomach acid production is screwed up due to long-term use of PPI. Now you are having a hyperacidity condition - your stomach produces too much acid. You also have hypersensitive pain receptors in your gut. Although the physical effect of acid is so mild that doctors didn't notice anything on endoscpe, you felt great pain from reflux, it's a classic scenario of hypersensitivity to pain.
It fits well because you are under tremendous stress and anxiety. When one is highly stressed, he feels more pain than usual.
All you need to do is calm yourself down. Take deep breaths when you feel pain, when your anxious thoughts come up.
Slowly adjust your eating habit back to soft, bland, alkaline diet. Adopt an eating routine. Take your PPI on time 30mins before meals, take your mylanta when needed. Drink plenty of water in the day to wash down the acid.
Ask your doctor for a prescription of Reglan. Tell the doctor you want to take it at bedtime to empty your stomach. Reglan also helps to constrict your LES sphincter. Take your dinner 4 hours before bedtime, sleep on an inclined bed, take your Reglan + H2 blocker or mylanta, you will have a good night's sleep. Reglan is only for short term. Drop it when your stomach is back to normal in future.