How should I deal with gastroenteritis and bitter taste in the mouth?

Patient's question:

Because I haven't been feeling well these past few days and also felt a bitter taste in my mouth, I went to the hospital yesterday for a check-up. The doctor confirmed it as gastroenteritis and gave me medication. However, after treating it for a day, I still feel a bitter taste in my mouth. What should I do?

Doctor's answer:

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