Diagnosed through upper gi gastritis moved from omeprazole to oesmaprole nexium (esomeprazole) 20mg past 6wks any advice after this?

Sure, but consider: PPI's differ as to duration of action, side effects, tolerance, cost/insurance coverage. All PPI's are equally efficacious, so what options exist after you complete your course of esomeprazole depends on your therapeutic response (e.g. symptom resolution, persistence, recurrence?) as well as the cause of your gastritis (e.g. if H.pylori was found, has it been treated to eradication?)