Thank you for the additional information,
Well it sounds like that you could have food poisoining and its possible that you could start to vomit or even develop diarrhea. the good news is that this usually only lasts for 24 hours at the maximum and during this time you can take lots of fluids in order to stay hydrated as well as drink a large amount of electrolyte rich fluids.
Next it's possible that you could have increased acidity in the stomach, or even gastritis which is an inflammation of the lining of the stomach. Its possible that gastritis was pre existing and flared up on drinking the grape juice. Another possibility is that you could have acid peptic disease which can cause the increased gas, burning and feeling of nausea. In most of these cases, taking OTC antacids can be helpful such as peptobismol or even a drug like prilosec which should bring rapid relief from these symptoms.
I would suggest you try the OTC prilosec or pepto-bismol and see if that helps, if the nausea worsens at any time, you can try OTC dramamine or even any other antiemetic which can help control the nausea. If the symptoms worsen at any time then you might have to see your doctor but for now i think this should help.
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