My surgeon gave me a “stomach protector” to take every morning before breakfast and said to take it as long as the antibiotics lasted, and I was still taking anti inflammatories. You can buy them otc in the U.K., don’t know about Eire. They really work, I forgot to take them sometimes and suffered like you. I live abroad now, mine are Omeprazole, but I’m sure a pharmacist could advise.
Cyprus


