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This is Dr. David
omeprazole would not cause stomach ulcers.
but H Pylori bacteria growth in the stomach can cause stomach ulcers. you need testing to check for H Pylori bacteria
you have to be off of omeprazole for 1-2 weeks before testing to look for H Pylori bacteria in the stomach.
also long term use of omeprazole can cause gastric atrophy or shrinkage of the stomach and low blood magnesium levels and also dysfunction of your liver and even C diff related diarrhea.
I would ask your GI doctor to see if they tested for H Pylori bacteria in your stomach when they did the endoscopy
ask if they saw evidence of gastric atrophy or strinkage of your stomach
if your stomach acid symptoms are better now, that could be the reason for decreasing the omeprazole
let me know if you have questions.