Thanks for all these additional information.
I understand your concern.
Well as you describe,chances of hiatus hernia are less.
Possible causes may include Gastroesophageal acid reflux,peptic ulcer.
However as you are currently taking Omeprazole 20 mg with little relief so I would recommend to see a gastroenterologist for a clinical examination and other prescribed medications like H-2-receptor blockers
Prokinetics can be helpful.
You should avoid smoking in possible.
Also you should try OTC Zantac 150 mg at bedtime.
You should try OTC Mylanta gas and metamucil.
Do deep breathing exercises.
With your family history,it's good to undergo further investigations like Upper GI scopy,H.Pylori. test,liver function test for further evaluation and management.
Early diagnosis and treatment provide good outcome.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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