Dried Neem Leaves. Make a tea. Drink some every day.
Yeah, the tea is bitter but it helped cure my acid stomach. Was taking a Pepcid AC several time a week. Now - none. Seemed to help my arthritis too.
Neem
Seriously
https://www.ncbi.nlm.nih.gov/pubmed/19140119
H(2)-receptor blockers and proton pump inhibitors are now used extensively to control gastric and duodenal ulcer, inflammation and pain, but these drugs have limitations and are not always affordable. The development of novel nontoxic antiulcer drugs, including from medicinal plants, is therefore desirable, and Azadirachta indica A. Juss, commonly known as Neem, is known to have potent gastroprotective and antiulcer effects.