Unfortunately, nausea (and heartburn) is a common side effect of Prednisone. Right now, you are on a pretty low dose and hopefully the nausea will not worsen. Does the stomach medicine help at all? Taking prednisone with food is generally enough to prevent nausea. Avoid things that worsen the symptoms, and try antacids (milk of magnesia and calcium tablets, like Tums), saltines, or ginger ale to lessen symptoms.
If the symptoms worsen or other worrisome symptoms appear, do contact your doctor,
Peace and Blessings
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