You might have an infection of sorts. Most "ulcers" are caused by bacterial or viral infections. Ulcers never heal until you address the infection. You could be in the beginning stages of one.
PPI's just lower stomach acid, which can lead to worse infections and many other maladies such as anemia and cancers. Temporary use is fine, but not long term for months or more.
Probiotics are where you need to start now. Also, exercise.