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If the bump is settled and you are not having vomiting;headache;dizziness
right now then the injury might not affect you and it is in process of healing.As for the discomfort in upper stomach it may be due to acidity and gastritis
for which you can take a antacid
300 mg twice a day before meals.Just in case you do not feel any improvement in next 2 days then you should consult a doctor for the stomach problem.