I had an
ulcer caused by H. pylori, and I used an antibiotic three times a day
for 10 days. I also took an acid reducer once a day that healed by stomach lining. Today, I take one Prilosec, 20-mg, and I have no pain. If you have gastritis and are not taken medication specifically for gastritis, your stomach lining can become worst, and you might develop an ulcer. If I were you, I would require your doctor, not his office staff, to confirm whether or not you have/had an ulcer caused by H.