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If you say it's sore to touch it could be two things. Either it is a soft tissue injury
or it could be a stomach ulcer
. You need to get an endoscopy
done to confirm. Avoid eating spicy or hot food. Stick to cool, bland meals. Drink plenty of water. TYry taking a PPI drug like Omeprazole
20mg in the morning half an hour before breakfast. Please speak to your Doctor regarding this and follow as he advises. DO NOT TAKE PAIN KILLERS WITHOUT CONSULTING THE DOCTOR.