My bf was diagnosed with h. pylori negative gastritis over a year ago (worse now). do you have experience treating patients with similar circumstances?

Gastritis: Often we treat h pylori negative gastritis with bland diet, avoidance of alcohol, caffeine and nicotine and a course of medications like prilosec or zantac. If symptoms persist despite adherence to this treatment regimen we try a different ppi like nexium or increase the dosage of prilosec. The next step is a follow-up gastroscopy to document the diagnosis if symptoms don't improve.