Potential role of probiotics in the management of gastric ulcer
"Gastric ulcers develop due to an imbalance between damaging factors and the defense mechanisms of the gastric mucosa (Fig. 2). The available studies in the literature indicate that probiotics can accelerate the healing of gastric ulcers via multiple mechanisms that involve both damaging and defensive factors (Fig. 2)."
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4906699/

Effect of probiotics on aspirin-induced gastric mucosal lesions
"Probiotic mixture pretreatment attenuates the aspirin-induced gastric lesions by reducing the lipid peroxidation, enhancing mucosal sIgA production, and stabilizing mucosal mast cell degranulation into the gastric mucosa."
http://europepmc.org/abstract/med/21480106

Probiotics Reduce Bacterial Colonization and Gastric Inflammation in H. pylori-Infected Mice
"The percentage of mice with moderate-severe H. pylori-induced inflammation in the gastric antrum was reduced with probiotic pretreatment (71 to 29%; P = 0.14)"
"This preparation of probiotics provided a safe and novel approach for reducing H. pylori colonization and bacterial-induced inflammation of mice."
https://link.springer.com/article/10.1023%2...2040.c2?LI=true

You get the general idea. Make it a habit to eat (real) yogurt, probiotic supplements, fermented stuffs.
Ought to heal over time, assuming you avoid eating junks (soft drinks, junk foods etc.).