M.W.
Bismuth, the active ingredient of Pepto Bismal and other generic equivalents is the most effective treatment for H. Pylori I know of. It is cheap & obtsinable OTC. The only se I know of is that overuse can cause incomplete digestion of food, which itself can cause stomach upset, same as all antacids.
Probiotics may help by restoring the normal balance of good GI bacteria that help you digest your food better too.