As other expert has opted out,so i want to help you further.
As you are suffering from last few days and self medications are not providing relief to your pain.
So in my opinion,you need to be seen by a gastroenterologist further for a clinical examination and undergo Upper GI scopy,Ultrasound Whole Abdomen to rule out underlying possible cause which may include Gastritis,Peptic ulcer,Gall bladder disease,Renal calculi.
You can try OTC Prilosec before meals and Zantac150 mg twice a day( morning and at bedtime) which are better than Tums.
If your symptoms persist then you may require other prescribed medications which may include-
Prokinetics that helps to strengthen the LES and make the stomach empty faster.
I hope this helps.
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