Thank you for your question.
Since how long are you having this problem?
Do you have any other medical problems?
Are you on any medications for anything?
Did you have endoscopy for nausea only?
Please let me know.
You need to see what has gone wrong.
I suggest a gastric emptying study, a type of x ray, to see if your stomach is emptying OK.
If you had gastritis or ulcer, you need to find out if you have h pylori, the bacteria that cases these, as they would need the correct antibiotics.
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