Thanks for all these additional information.
I understand your concern.
Well as you describe,your symptoms are suggestive of gastritis.
And you should take OTC Prilosec before meals in morning and Zantac 150 mg at bed time after meals.
Also hydrate yourself with plenty of fluids.
You can continue gas X.
And try liquid Gaviscon now.
Discontinue alcohol intake as it can be contributing factor.
You should take banana,bland diet.
Eat small meals throughout the day.
Elevate your head while sleeping.
If your symptoms'll not improve then see your doctor for further evaluation and management.
In case you develop severe chest pain then visit ER and EKG must be done in your case.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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