I have acid reflux as a matter of course, and take Losec every night to control it. Something has damaged the lining of your stomach [Ibuprofen probably] and it needs to be restored. It means a light diet and bland food for a while. A short course of Zantac will cut down the amount of acid your tummy produces and speed up recovery.
Stay away from fried food, reheated food, and spicy meals. Drink milk if you can take it, and raise the head of your bed to keep the acid down in your stomach, when you lie down.
Giok