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Since how long are the symptoms? Do you have urinary burning, bloating, nausea, loss of appetite, diarrhea/ constipation? Were any other investigations done apart from what you have mentioned? Are the pains intermittent or continuous? What is the severity of the pain on the scale of 0-10? Do you regularly take alcohol? Any significant past medical or surgical history? Are you on any kind of medications?
The following are the possibilities of the cause with the character and site of your pain, history of alcohol, and help with the citrus soda (clinical manifestations);
2) Gastroesophageal reflux disease
3) Gall bladder dysfunctions
You can try antacids like Tums or Maalox and acid blockers like Prilosec, which are available without prescription. If these do not help or your symptoms increase or new symptoms appear, it would be prudent to seek help of an urgent care clinic or talking to your primary care physician. An ultrasound of the abdomen and may be an upper gastrointestinal endoscopy with the physical exam should be able to give the clues to the diagnosis and guidelines for the further management.
Please feel free for your follow up questions.
A kidney stone or ureteric stone is a possibility with the site of the pain although rest of your clinical presentation, does not support it. If no investigations are done, it boils down to the therapeutic diagnosis. If you respond to the antacids and acid blockers, probably they would go in favor of esophagitis, gastritis or related disorder, and if not, they would be ruled out. A classical heart burn sometimes may not be felt with these disorders.
Avoid caffeine and alcohol drinks meanwhile, if you take them.
It is pleasure assisting you.