Have you ever heard of rebamipide? It's a very safe and benign drug that heals gastritis and other GI tract injuries by increasing production of prostaglandin E2, basically the opposite effect of NSAID drugs. You can order it from asian pharmacies if it isn't available locally. It doesn't work for everyone but some percentage have tremendous success with it.
Here is one reliable Japanese pharmacy I have used:
HOME | Natural Pharmacy They actually have a wide selection of gastroprotective drugs that are not available in the US or Europe if you are feeling adventurous, including rebamipide, troxipide, irsogladine, and many more.