I was diagnosed with GERD in 1997 also gastritis. Originally took a proton pump inhibitor but developed over a year later allergic reaction (rash and itching). Then samething happened with h2blockers. For years I managed with gaviscon and occassional flare ups that I treated with liquid antacid Recently my gastritis is pretty constant and usual methods not working. Gastroscopy showed metaplasia on one of biopsies, and chronic gastritis. Have appt next Friday with allergist to see if there is a way to tolerate either an h2 blocker or ppi. Perhaps in combination with daily antihistamine. Will see. I am very careful with my diet but my usual methods no longer working.